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These are the user uploaded subtitles that are being translated: 1 00:00:03,004 --> 00:00:06,805 Narrator: In all the oceans of the world, 2 00:00:06,841 --> 00:00:10,709 this shark is known as most dangerous to people. 3 00:00:14,682 --> 00:00:17,850 It has a jaw full of razor-sharp teeth. 4 00:00:20,121 --> 00:00:23,122 Man: It just came out of the water and bit my arm. 5 00:00:26,460 --> 00:00:28,927 Narrator: And a nasty disposition. 6 00:00:30,831 --> 00:00:32,364 (shouting) 7 00:00:32,400 --> 00:00:33,599 man: Whoa! 8 00:00:35,236 --> 00:00:38,537 Narrator: The bull shark hunts where we play. 9 00:00:41,342 --> 00:00:43,308 (muffled scream) 10 00:00:43,344 --> 00:00:46,912 and now, it's on the move. 11 00:00:48,582 --> 00:00:52,885 Man: Bull sharks have no trouble being upriver in freshwater. 12 00:00:52,920 --> 00:00:54,486 (scream) 13 00:00:54,522 --> 00:00:58,557 narrator: Coming soon to a shore near you. 14 00:00:58,592 --> 00:01:02,261 Man: I don't think they realize that the sharks are here. 15 00:01:02,296 --> 00:01:05,631 ♪ ♪ 16 00:01:08,636 --> 00:01:12,471 ♪ ♪ 17 00:01:12,506 --> 00:01:15,441 narrator: Great whites may have a fearsome reputation. 18 00:01:18,145 --> 00:01:21,513 But out of more than 400 species of shark, 19 00:01:21,549 --> 00:01:24,616 there's one that is considered even more dangerous. 20 00:01:27,421 --> 00:01:31,090 It's the bull shark. 21 00:01:31,125 --> 00:01:32,658 A creature with a reputation 22 00:01:32,693 --> 00:01:35,060 for being exceptionally aggressive. 23 00:01:38,933 --> 00:01:40,899 Mike heithaus: I kind of think of bull sharks 24 00:01:40,935 --> 00:01:44,169 as the pit bulls of the oceans. 25 00:01:44,205 --> 00:01:47,039 They are probably more impressive predators 26 00:01:47,074 --> 00:01:50,642 than other sharks that are the same length. 27 00:01:50,644 --> 00:01:51,977 Most sharks will only attack prey 28 00:01:52,012 --> 00:01:55,013 that's maybe 10%, 15% of their own body size. 29 00:01:55,049 --> 00:01:58,984 For bull sharks, all bets are off, because they are so strong. 30 00:02:01,655 --> 00:02:03,622 Narrator: Aggressive... 31 00:02:03,657 --> 00:02:05,257 Fast... 32 00:02:05,292 --> 00:02:06,792 And fearless. 33 00:02:10,798 --> 00:02:13,899 Bulls are a threat wherever they're found. 34 00:02:18,739 --> 00:02:22,774 Charles bangley: The distribution of the bull shark is worldwide. 35 00:02:22,810 --> 00:02:25,010 If I had one word to sum up the bull shark, 36 00:02:25,045 --> 00:02:27,646 it would be adaptable. 37 00:02:27,681 --> 00:02:32,417 That makes them kind of unique among a lot of shark species. 38 00:02:32,453 --> 00:02:37,723 Narrator: The bull shark favors warm, shallow waters, 39 00:02:37,758 --> 00:02:40,759 making it a danger to swimmers around the world. 40 00:02:44,965 --> 00:02:49,401 And it's likely responsible for more attacks than we realize. 41 00:02:51,138 --> 00:02:53,138 ♪ ♪ 42 00:02:53,174 --> 00:02:58,510 ♪ ♪ 43 00:02:58,546 --> 00:03:04,917 ♪ ♪ 44 00:03:04,952 --> 00:03:07,586 June 2015. 45 00:03:07,621 --> 00:03:11,857 16-year-old hunter treschl enjoys a day at the beach. 46 00:03:13,727 --> 00:03:15,727 Hunter treschl: I was in oak island for a family vacation. 47 00:03:15,763 --> 00:03:18,430 We'd just taken like a day trip down there. 48 00:03:18,465 --> 00:03:20,832 Me and my cousin and my grandma. 49 00:03:22,603 --> 00:03:26,305 And we had been there for probably like three, four hours. 50 00:03:29,643 --> 00:03:33,478 So, I was just kind of walking out, 51 00:03:33,514 --> 00:03:35,547 getting ready to wash off. 52 00:03:39,053 --> 00:03:42,454 And I stop about waist-high water. 53 00:03:44,358 --> 00:03:46,592 And the water was like super murky at this point 54 00:03:46,627 --> 00:03:49,661 because there was a storm offshore. 55 00:03:49,697 --> 00:03:52,798 So, I could see kinda my upper thighs and that's it. 56 00:03:52,833 --> 00:03:54,800 ♪ ♪ 57 00:03:54,835 --> 00:04:00,772 ♪ ♪ 58 00:04:00,808 --> 00:04:04,176 I knelt down, crouched down, maybe 50 feet from shore. 59 00:04:09,016 --> 00:04:12,150 I felt this solid bump on my ankles. 60 00:04:12,186 --> 00:04:17,356 ♪ ♪ 61 00:04:17,391 --> 00:04:19,958 I assumed it was a stingray. 62 00:04:19,994 --> 00:04:21,593 That's like a pretty normal thing to have happen 63 00:04:21,629 --> 00:04:24,997 down in north carolina. 64 00:04:25,032 --> 00:04:26,965 I started backing up. 65 00:04:27,001 --> 00:04:30,002 ♪ ♪ 66 00:04:30,037 --> 00:04:36,575 ♪ ♪ 67 00:04:36,610 --> 00:04:37,976 and that's the first moment when I realized 68 00:04:38,012 --> 00:04:39,978 that it wasn't a stingray. 69 00:04:44,485 --> 00:04:46,585 It was a shark. 70 00:04:48,322 --> 00:04:51,156 It just came out of the water and bit my arm. 71 00:04:53,694 --> 00:04:56,762 Grabbed me toward the bottom of my arm, 72 00:04:56,797 --> 00:05:00,299 took the arm below the elbow in that first bite. 73 00:05:04,605 --> 00:05:07,339 And then it was just gone, just like that. 74 00:05:21,989 --> 00:05:24,356 I was awake through this whole thing. 75 00:05:26,293 --> 00:05:28,493 There was a crowd around. 76 00:05:28,529 --> 00:05:32,664 There were people with towels trying to stop the bleeding. 77 00:05:32,700 --> 00:05:34,633 Narrator: Hunter couldn't identify the kind of shark 78 00:05:34,668 --> 00:05:37,769 that attacked him. 79 00:05:37,805 --> 00:05:39,971 But based on the size of his wounds, 80 00:05:40,007 --> 00:05:44,176 experts make a pretty good guess: 81 00:05:44,211 --> 00:05:46,945 A bull shark. 82 00:05:46,980 --> 00:05:48,280 Hunter: They estimated it being 83 00:05:48,315 --> 00:05:51,316 about seven and a half to eight and a half feet long. 84 00:05:53,020 --> 00:05:54,186 Prior to the attack, 85 00:05:54,221 --> 00:05:57,923 I didn't actually know much about bull sharks. 86 00:05:57,958 --> 00:06:00,926 Now after my attack, I feel like I've learned a lot more. 87 00:06:00,961 --> 00:06:05,497 They are one of the more aggressive breeds of shark. 88 00:06:05,532 --> 00:06:08,934 I'm super lucky to have gotten out from that experience alive. 89 00:06:12,106 --> 00:06:13,739 Narrator: Researchers have confirmed 90 00:06:13,774 --> 00:06:16,842 100 bull shark attacks. 91 00:06:18,645 --> 00:06:23,215 But the real number may be much higher, 92 00:06:23,250 --> 00:06:26,818 because the bull shark is so difficult to identify. 93 00:06:30,357 --> 00:06:32,023 Mike: When you first look at a bull shark, 94 00:06:32,059 --> 00:06:34,893 it doesn't really jump out at you that it's a bull shark. 95 00:06:34,928 --> 00:06:36,628 It just kind of looks like other sharks, you know, 96 00:06:36,663 --> 00:06:38,964 kind of grayish-brown on top, white below. 97 00:06:38,999 --> 00:06:41,733 That's really different from an iconic species 98 00:06:41,769 --> 00:06:44,903 like the tiger shark that has that really square head 99 00:06:44,938 --> 00:06:49,441 and those stripes that set it apart from any other species. 100 00:06:49,476 --> 00:06:51,576 Then you also have white sharks, 101 00:06:51,612 --> 00:06:53,712 nobody's gonna mistake a white shark, 102 00:06:53,747 --> 00:06:56,248 this is a really iconic look. 103 00:06:56,283 --> 00:06:59,017 You have the torpedo shape, the tail, 104 00:06:59,052 --> 00:07:02,554 the bright white belly, kind of slate gray above. 105 00:07:04,591 --> 00:07:09,694 Narrator: The bull shark's looks aren't showy or iconic. 106 00:07:09,730 --> 00:07:13,632 But if you know what to look for, you'll never forget it. 107 00:07:15,669 --> 00:07:18,703 Mike: When you really start to look closer at the bull sharks, 108 00:07:18,739 --> 00:07:23,942 you see some features that differ from typical shark shape. 109 00:07:23,977 --> 00:07:26,645 They almost look like swimming mouths at times. 110 00:07:26,680 --> 00:07:30,382 They're really thick from those pectoral fins forward, 111 00:07:30,417 --> 00:07:32,083 you know, huge jaws, 112 00:07:32,119 --> 00:07:35,754 and then they've got the musculature to back that up. 113 00:07:42,329 --> 00:07:45,297 Narrator: June 2005. 114 00:07:45,332 --> 00:07:48,333 16-year-old craig hutto and his brother, brian, 115 00:07:48,368 --> 00:07:51,870 are fishing in waist-deep water 30 yards from shore. 116 00:07:55,509 --> 00:07:59,978 Craig hutto: We were making our way kinda in the gully. 117 00:08:00,013 --> 00:08:03,582 I really didn't have any worries or anything. 118 00:08:08,322 --> 00:08:11,590 Something came up underwater, I didn't see anything. 119 00:08:13,927 --> 00:08:16,862 Something bumped me on my left leg. 120 00:08:20,968 --> 00:08:24,836 Something grabbed me on my right leg and took me underwater. 121 00:08:29,076 --> 00:08:31,710 It's just like that going into shock right then, 122 00:08:31,745 --> 00:08:34,980 is kinda my whole body just went numb. 123 00:08:36,750 --> 00:08:41,019 Brian hutto: That's when I saw its back come out of the water. 124 00:08:42,523 --> 00:08:48,126 There's this fin that just kinda sweeps up and grabs him 125 00:08:48,161 --> 00:08:50,295 and rolls over on top of him. 126 00:08:53,133 --> 00:08:54,900 Craig: My first real instinct was 127 00:08:54,935 --> 00:08:58,403 I need to get this shark off of me. 128 00:08:58,438 --> 00:09:01,273 I've heard from somebody saying that a shark's tooth is so sharp 129 00:09:01,308 --> 00:09:04,609 that it can bite you and you not even feel it. 130 00:09:04,645 --> 00:09:06,144 And I think that's what happened to my hands 131 00:09:06,179 --> 00:09:10,048 'cause in a split second I put my hands down. 132 00:09:10,083 --> 00:09:12,250 I looked up at my hands and it was just, 133 00:09:12,286 --> 00:09:16,021 my hands were just cut open, just torn to pieces. 134 00:09:21,662 --> 00:09:24,129 Narrator: The shark releases craig for a moment, 135 00:09:24,164 --> 00:09:27,399 giving his brother enough time to drag him to shore. 136 00:09:30,671 --> 00:09:35,206 It takes five months for craig's hands to heal. 137 00:09:35,242 --> 00:09:38,810 But his right leg is too damaged to save. 138 00:09:43,383 --> 00:09:48,420 The only warning he had for the attack was a bump on his leg. 139 00:09:51,391 --> 00:09:53,325 Mike: Now a lot of times when we think about sharks, 140 00:09:53,360 --> 00:09:56,094 we think about, you know, maybe mindless eating machines 141 00:09:56,129 --> 00:09:58,863 just charging in to grab things right away. 142 00:09:58,899 --> 00:10:02,067 But that's not always what they do. 143 00:10:02,135 --> 00:10:04,369 Narrator: The bull shark uses its bump to test 144 00:10:04,404 --> 00:10:08,740 whether its victim is going to fight back. 145 00:10:08,775 --> 00:10:10,175 Mike: When they see something and they're not sure 146 00:10:10,210 --> 00:10:11,843 if it's prey or not, they might do something like this, 147 00:10:11,878 --> 00:10:13,745 which is just give it that little bump 148 00:10:13,780 --> 00:10:15,780 so they can figure out, you know, is this something 149 00:10:15,816 --> 00:10:20,785 I want to eat or something I want to just leave alone? 150 00:10:20,821 --> 00:10:23,555 Narrator: If the bull shark's bump isn't challenged, 151 00:10:23,590 --> 00:10:26,891 it then moves in for the kill. 152 00:10:26,927 --> 00:10:28,426 George burgess: They'll come back to do the bite, 153 00:10:28,462 --> 00:10:33,498 which usually is in the lower quadrant of the body. 154 00:10:33,533 --> 00:10:36,368 Narrator: Making the bull shark's bite so devastating: 155 00:10:36,403 --> 00:10:40,705 An arsenal of razor-sharp teeth. 156 00:10:40,741 --> 00:10:41,973 George: On each of these teeth, 157 00:10:42,009 --> 00:10:44,376 there's little serrations on each side, 158 00:10:44,411 --> 00:10:46,177 so when the animal bites, 159 00:10:46,213 --> 00:10:50,148 it not only uses the pointed tips to cut, 160 00:10:50,183 --> 00:10:53,551 but those serrated teeth get into the flesh 161 00:10:53,587 --> 00:10:57,722 and then they literally cut off what they want. 162 00:10:59,726 --> 00:11:01,459 Mike: As they shift their jaw, 163 00:11:01,495 --> 00:11:03,662 it can kind of cut and slice as well 164 00:11:03,697 --> 00:11:06,364 and cut out big chunks of their prey. 165 00:11:08,869 --> 00:11:13,238 Narrator: The bull shark has 50 functional teeth, 166 00:11:13,273 --> 00:11:16,408 with up to 6 replacement teeth in each row. 167 00:11:16,443 --> 00:11:20,679 That's up to 300 teeth in its mouth at any given time. 168 00:11:23,717 --> 00:11:27,185 A bull shark might grow as many as 65,000 teeth 169 00:11:27,220 --> 00:11:30,021 in its lifetime. 170 00:11:30,057 --> 00:11:34,392 But as soon as it loses one, another rises in its place. 171 00:11:36,830 --> 00:11:39,564 George: You can see the replacement teeth. 172 00:11:39,599 --> 00:11:43,234 Behind each tooth there's a row of other teeth. 173 00:11:43,270 --> 00:11:46,905 And every two weeks or so a new tooth comes in from behind 174 00:11:46,940 --> 00:11:52,143 and it keeps making teeth for its entire life. 175 00:11:52,179 --> 00:11:53,778 Narrator: It's not just the teeth that make 176 00:11:53,814 --> 00:11:57,182 a bull shark's bite so killer. 177 00:11:57,217 --> 00:12:00,351 Its power comes from its jaw structure. 178 00:12:03,090 --> 00:12:06,591 Mike: Their mouth is kinda back in under the snout a little bit, 179 00:12:06,626 --> 00:12:09,461 so if it just opened the lower jaw, 180 00:12:09,496 --> 00:12:13,264 it would be really hard for it to get something big. 181 00:12:13,300 --> 00:12:15,667 But the bull sharks kinda protrude their jaw forward 182 00:12:15,702 --> 00:12:17,235 when they open their mouth. 183 00:12:19,806 --> 00:12:25,643 And so then they can clamp on to prey, including really big prey. 184 00:12:25,679 --> 00:12:28,113 Narrator: Like tarpons, 185 00:12:28,148 --> 00:12:30,281 turtle shells, 186 00:12:30,317 --> 00:12:32,150 other sharks, 187 00:12:32,185 --> 00:12:34,853 and sometimes, people. 188 00:12:40,060 --> 00:12:43,661 Biologist dr. Brady barr has tested the bite force 189 00:12:43,697 --> 00:12:46,731 of some of the world's biggest predators, 190 00:12:46,766 --> 00:12:49,601 including sharks. 191 00:12:49,636 --> 00:12:51,970 Brady barr: Oh, look at that! 192 00:12:52,005 --> 00:12:54,038 Narrator: Now he's after a great white 193 00:12:54,074 --> 00:12:56,274 off the coast of south africa. 194 00:12:56,309 --> 00:12:58,476 Brady: Whoa, come on, baby. 195 00:12:58,512 --> 00:12:59,677 Narrator: They've got one, 196 00:12:59,713 --> 00:13:03,648 about 4,000 pounds and 16 feet long. 197 00:13:03,683 --> 00:13:05,450 Brady: Whoa! 198 00:13:09,990 --> 00:13:12,657 Got it, got it, we got a bite, we got a bite! 199 00:13:15,462 --> 00:13:18,997 Narrator: He reads the pounds of force per square inch. 200 00:13:20,901 --> 00:13:22,867 Brady: I mean, 669. 201 00:13:22,903 --> 00:13:25,003 That is a heck of a bite! 202 00:13:28,241 --> 00:13:30,441 Narrator: Next up: Testing the bite force 203 00:13:30,477 --> 00:13:34,546 of a much smaller bull shark off the coast of florida. 204 00:13:34,581 --> 00:13:36,114 Brady: Careful! 205 00:13:39,920 --> 00:13:41,519 Oh, look at the size of that! 206 00:13:41,555 --> 00:13:44,455 That is a monster bull shark! 207 00:13:44,491 --> 00:13:46,224 Narrator: Which bite is stronger? 208 00:13:46,259 --> 00:13:49,761 The great white or the bull shark? 209 00:13:49,796 --> 00:13:51,029 Brady: Whoa! 210 00:13:56,069 --> 00:13:56,935 Narrator: Biologist dr. Brady barr is off the coast 211 00:13:58,638 --> 00:14:01,172 of florida to test the bite strength 212 00:14:01,208 --> 00:14:03,274 of a fearsome bull shark. 213 00:14:06,046 --> 00:14:07,612 Brady: So the idea is you're just gonna pull the shark's head 214 00:14:07,647 --> 00:14:08,980 up out of the water, 215 00:14:09,015 --> 00:14:11,583 and I'll stick the bite force meter down in there. 216 00:14:13,220 --> 00:14:15,320 I'm using the bite force meter 217 00:14:15,355 --> 00:14:17,355 that I normally use for crocodiles. 218 00:14:17,390 --> 00:14:20,558 I'm gonna get a digital read-out here of pounds of force. 219 00:14:20,594 --> 00:14:22,760 And this shark is angry and it's a bull shark. 220 00:14:22,796 --> 00:14:25,296 I have a feeling we're gonna get a huge bite! 221 00:14:28,335 --> 00:14:30,134 Come on, open your mouth! 222 00:14:32,772 --> 00:14:34,873 Look at those teeth! 223 00:14:34,908 --> 00:14:37,709 Oh, 989! 224 00:14:37,744 --> 00:14:39,878 989 pounds! 225 00:14:39,913 --> 00:14:43,414 That's literally half a ton of bite force 226 00:14:43,450 --> 00:14:47,185 from a 300-pound bull shark! 227 00:14:47,220 --> 00:14:49,320 Narrator: The bull is less than half the length 228 00:14:49,356 --> 00:14:52,657 and only a third of the weight of a great white. 229 00:14:52,692 --> 00:14:57,161 But its bite is more than 300 pounds of force stronger. 230 00:14:59,566 --> 00:15:03,968 The bull's head is wider than most other shark heads. 231 00:15:04,004 --> 00:15:06,671 That extra width means more muscle, 232 00:15:06,706 --> 00:15:10,675 which means more jaw strength. 233 00:15:10,744 --> 00:15:12,143 George: There's a great deal of weight 234 00:15:12,178 --> 00:15:14,779 used in the biting process, 235 00:15:14,848 --> 00:15:17,882 simply because of the mass of the head. 236 00:15:22,756 --> 00:15:24,455 Narrator: The bull shark's bite is greater 237 00:15:24,491 --> 00:15:26,724 than any other shark. 238 00:15:26,760 --> 00:15:31,029 It can exert 1,300 pounds toward the back of the jaw 239 00:15:31,064 --> 00:15:34,165 and over 450 pounds up front. 240 00:15:35,635 --> 00:15:39,003 How it deploys all that force is also unique, 241 00:15:39,039 --> 00:15:42,707 with terrifying savagery. 242 00:15:42,742 --> 00:15:45,343 George: What makes bull sharks distinct from other species 243 00:15:45,378 --> 00:15:49,247 of sharks is the aggressiveness of their attacks. 244 00:15:51,985 --> 00:15:54,452 Narrator: July 6, 2001. 245 00:15:56,756 --> 00:15:59,424 8-year-old jessie arbogast and his cousins 246 00:15:59,459 --> 00:16:02,727 play in the shallow waters off pensacola, florida. 247 00:16:04,631 --> 00:16:06,698 (screaming) 248 00:16:09,369 --> 00:16:12,370 suddenly, an enormous bull shark bites down 249 00:16:12,405 --> 00:16:15,206 on jessie's right arm 250 00:16:15,241 --> 00:16:17,075 and begins to shake. 251 00:16:17,110 --> 00:16:22,547 ♪ ♪ 252 00:16:22,582 --> 00:16:27,418 it tears the arm from his body, 253 00:16:27,454 --> 00:16:30,989 and goes on to rip off a large piece of his thigh. 254 00:16:31,024 --> 00:16:37,095 ♪ ♪ 255 00:16:37,130 --> 00:16:41,499 jessie's uncle grabs the 7-foot animal by the tail 256 00:16:41,534 --> 00:16:44,602 and drags it onto the beach. 257 00:16:44,637 --> 00:16:47,505 A park ranger shoots the shark. 258 00:16:47,540 --> 00:16:51,809 They find jessie's arm still in its mouth, intact. 259 00:17:00,720 --> 00:17:04,722 Surgeons reattach the arm. 260 00:17:04,758 --> 00:17:08,559 But severe blood loss leaves jessie brain damaged. 261 00:17:11,264 --> 00:17:16,834 In just a few seconds, his life has been changed forever 262 00:17:16,870 --> 00:17:21,239 by two bites from this aggressive bull shark. 263 00:17:21,274 --> 00:17:25,676 George: Bull sharks will come back for second and third bites. 264 00:17:25,712 --> 00:17:30,715 In many cases will finish off their victim one way or another. 265 00:17:30,750 --> 00:17:34,886 We very frequently hear that the shark was following the victim 266 00:17:34,921 --> 00:17:37,021 right up to the shoreline. 267 00:17:39,459 --> 00:17:41,959 Mike: If you're a bull shark and you're attacking something big, 268 00:17:41,995 --> 00:17:44,529 you're likely to make bites in fairly rapid succession 269 00:17:44,564 --> 00:17:47,131 because if it starts to get too far away, 270 00:17:47,167 --> 00:17:50,802 it may maneuver enough to avoid that killing bite. 271 00:17:53,606 --> 00:17:56,974 Narrator: An attack can be lightning quick. 272 00:17:57,010 --> 00:18:00,711 A bull shark cruises slowly near the bottom. 273 00:18:00,747 --> 00:18:06,217 It's capable of achieving a burst up to 11 miles per hour. 274 00:18:06,252 --> 00:18:08,453 Mike: If you're prey, a bull shark's on top of you 275 00:18:08,488 --> 00:18:10,455 before you know it. 276 00:18:15,261 --> 00:18:17,829 Narrator: In August 2000, 277 00:18:17,864 --> 00:18:21,699 69-year-old thadeus kubinski and his wife anna 278 00:18:21,734 --> 00:18:25,136 decide to go for a quick swim in the inlet behind their home 279 00:18:25,171 --> 00:18:27,605 in boca ciega bay, florida. 280 00:18:31,978 --> 00:18:35,713 Thadeus jumps in first. 281 00:18:35,748 --> 00:18:40,118 He swims in five feet of water, yards from the dock. 282 00:18:40,153 --> 00:18:42,153 ♪ ♪ 283 00:18:42,188 --> 00:18:48,192 ♪ ♪ 284 00:18:48,228 --> 00:18:54,999 ♪ ♪ 285 00:18:55,034 --> 00:18:58,269 suddenly, he's attacked by a shark. 286 00:18:59,572 --> 00:19:03,174 It kills kubinski with a bite into his chest, 287 00:19:03,209 --> 00:19:05,610 15 inches across. 288 00:19:07,780 --> 00:19:12,950 Authorities recover a shark tooth from kubinski's body. 289 00:19:12,986 --> 00:19:15,086 It belongs to a bull, 290 00:19:15,121 --> 00:19:19,690 estimated to be nearly 9 feet long and 400 pounds. 291 00:19:21,628 --> 00:19:24,395 As big as it was, 292 00:19:24,430 --> 00:19:27,131 kubinski never saw it coming. 293 00:19:31,004 --> 00:19:36,207 Mike: So, you can see here, that shark is almost invisible, 294 00:19:36,242 --> 00:19:40,978 and it just kind of materializes out of nowhere. 295 00:19:41,014 --> 00:19:42,480 Narrator: In the murky water, 296 00:19:42,515 --> 00:19:46,350 the quick-swimming bull shark can sneak up on anyone. 297 00:19:46,386 --> 00:19:50,688 Even the most experienced swimmers. 298 00:19:50,723 --> 00:19:57,461 ♪ ♪ 299 00:19:57,497 --> 00:20:00,798 shark biologist greg skomal knows firsthand 300 00:20:00,833 --> 00:20:03,467 the dangers of swimming with bull sharks. 301 00:20:07,140 --> 00:20:09,407 Greg skomal: My name's greg skomal. I'm a shark biologist. 302 00:20:09,442 --> 00:20:10,675 I'm affiliated with 303 00:20:10,710 --> 00:20:12,376 the massachusetts division of marine fisheries. 304 00:20:12,412 --> 00:20:16,013 I've been studying sharks for over 30 years. 305 00:20:16,049 --> 00:20:18,015 Narrator: Skomal's latest project: 306 00:20:18,051 --> 00:20:19,917 Tagging a variety of sharks 307 00:20:19,953 --> 00:20:23,087 to see if their movements are impacted by weather. 308 00:20:26,259 --> 00:20:28,793 Greg: Gotcha, gotcha! 309 00:20:28,828 --> 00:20:31,295 It's on, woo-hoo! 310 00:20:31,331 --> 00:20:34,065 Narrator: He tags a dangerous tiger shark. 311 00:20:38,037 --> 00:20:42,039 Now skomal wants to tag an even more aggressive shark, 312 00:20:42,075 --> 00:20:43,608 a bull. 313 00:20:46,779 --> 00:20:48,346 Greg: Bull sharks arrive here every day, 314 00:20:48,381 --> 00:20:53,384 so I'm hoping to get a tag on one of these animals underwater. 315 00:20:53,419 --> 00:20:56,254 Narrator: Skomal has decades of experience. 316 00:20:56,289 --> 00:21:00,992 He knows tagging a bull shark is risky business. 317 00:21:01,027 --> 00:21:03,060 Greg: Now I've got to admit that getting in the water 318 00:21:03,096 --> 00:21:05,896 with bull sharks, I've got my concerns. 319 00:21:05,932 --> 00:21:09,934 I'm certainly going to be keeping my eye open. 320 00:21:09,969 --> 00:21:11,969 Narrator: But today skomal just may be 321 00:21:12,005 --> 00:21:14,572 putting his life on the line. 322 00:21:14,607 --> 00:21:17,575 Just because you can't see a bull shark 323 00:21:17,610 --> 00:21:20,478 doesn't mean it can't see you. 324 00:21:26,386 --> 00:21:29,053 Narrator: Research scientist dr. Greg skomal 325 00:21:29,088 --> 00:21:31,489 swims in the bahamas, 326 00:21:31,524 --> 00:21:31,922 hoping to find a bull shark before it finds him. 327 00:21:39,132 --> 00:21:42,099 Skomal swims just below the surface. 328 00:21:42,135 --> 00:21:48,606 ♪ ♪ 329 00:21:48,641 --> 00:21:51,442 greg: I can't see anything down here. 330 00:21:59,385 --> 00:22:01,118 Wait, wait! Whoa, whoa! Whoa, whoa! What is that? 331 00:22:01,154 --> 00:22:05,022 Is that a bull shark coming at me?! 332 00:22:05,058 --> 00:22:06,791 I'm coming up, I'm coming up! 333 00:22:06,826 --> 00:22:10,094 ♪ ♪ 334 00:22:10,129 --> 00:22:16,100 ♪ ♪ 335 00:22:16,135 --> 00:22:22,640 ♪ ♪ 336 00:22:22,675 --> 00:22:26,711 narrator: Skomal's experiment has to wait. 337 00:22:26,746 --> 00:22:28,346 In such poor visibility, 338 00:22:28,381 --> 00:22:32,950 the risk of an attack is far too great. 339 00:22:32,985 --> 00:22:35,920 Greg: Frankly, I'm not super comfortable 340 00:22:35,955 --> 00:22:39,690 with bull sharks in places where I can't see them! 341 00:22:39,726 --> 00:22:41,258 Narrator: It's a good call. 342 00:22:41,294 --> 00:22:44,195 In murky water, the bull shark's super senses 343 00:22:44,230 --> 00:22:46,397 give it a clear advantage. 344 00:22:46,432 --> 00:22:48,966 Mike: Bull sharks have incredible sensory systems, 345 00:22:49,001 --> 00:22:52,870 so murky water for them is no trouble. 346 00:22:52,905 --> 00:22:54,372 George: The bull shark is pre-adapted 347 00:22:54,407 --> 00:22:56,474 for these conditions 348 00:22:56,509 --> 00:22:58,309 where it can rely on other senses 349 00:22:58,344 --> 00:23:00,745 other than just pure eyesight. 350 00:23:02,382 --> 00:23:05,383 Narrator: Sharks are literally wired for hunting. 351 00:23:05,418 --> 00:23:08,152 Special pores around their faces detect 352 00:23:08,187 --> 00:23:12,790 the electrical currents coming from other animals, 353 00:23:12,825 --> 00:23:14,592 allowing bull sharks to hunt 354 00:23:14,627 --> 00:23:17,328 without relying on their eyesight. 355 00:23:19,866 --> 00:23:23,200 George: Bull sharks, they have tiny little eyes, 356 00:23:23,236 --> 00:23:27,104 and they rely more on their senses of smell and hearing 357 00:23:27,140 --> 00:23:30,808 in detecting movements. 358 00:23:30,843 --> 00:23:34,912 And so, they do particularly well in turbid water, 359 00:23:34,947 --> 00:23:39,517 which is the norm at the mouths of rivers and in estuaries. 360 00:23:39,552 --> 00:23:41,285 Mike: For a predator like a bull shark, 361 00:23:41,320 --> 00:23:43,921 an estuary is really great 362 00:23:43,956 --> 00:23:46,557 because you've got all those nutrients coming out of rivers 363 00:23:46,592 --> 00:23:50,094 and off the land, lots of plankton, sea grass, 364 00:23:50,129 --> 00:23:53,731 and that feeds tons of fish. 365 00:23:53,766 --> 00:23:55,099 George: Bull sharks instantly become 366 00:23:55,134 --> 00:23:57,501 the largest predator in the area. 367 00:23:57,537 --> 00:24:00,604 And they're able to find ample food supplies 368 00:24:00,640 --> 00:24:04,275 that others cannot. 369 00:24:04,310 --> 00:24:07,278 Narrator: Unlike other sharks, the bull shark doesn't 370 00:24:07,313 --> 00:24:11,382 just swim outside the mouth of a river. 371 00:24:11,417 --> 00:24:14,518 It can swim into the river itself. 372 00:24:17,457 --> 00:24:19,590 That's because bull sharks are armed 373 00:24:19,625 --> 00:24:23,327 with an astonishing adaptation: 374 00:24:23,362 --> 00:24:27,598 They can survive in saltwater and freshwater. 375 00:24:29,335 --> 00:24:33,170 Mike: Bull sharks can actually change their physiology enough 376 00:24:33,206 --> 00:24:35,739 to survive under these two incredibly different 377 00:24:35,775 --> 00:24:39,243 sets of conditions. 378 00:24:39,278 --> 00:24:43,948 Narrator: Sharks need salt inside their bodies to survive. 379 00:24:43,983 --> 00:24:46,050 As they enter freshwater, 380 00:24:46,085 --> 00:24:50,421 the internal salt levels become diluted. 381 00:24:50,456 --> 00:24:54,024 The lack of salt causes the shark's cells to expand 382 00:24:54,060 --> 00:24:56,860 and their bodies to bloat, 383 00:24:56,863 --> 00:24:58,295 killing them. 384 00:25:00,166 --> 00:25:05,002 But the bull shark has a gland toward the tail 385 00:25:05,037 --> 00:25:08,973 that shuts down to hold salt in. 386 00:25:09,008 --> 00:25:11,275 While its long, specialized kidneys work 387 00:25:11,310 --> 00:25:14,345 to reuse the salt already in the body. 388 00:25:16,015 --> 00:25:19,316 Mike: So unlike other sharks, the bull sharks can switch 389 00:25:19,352 --> 00:25:22,319 back and forth between being good in freshwater 390 00:25:22,355 --> 00:25:25,823 and being good in the ocean. 391 00:25:25,858 --> 00:25:27,925 Narrator: This supreme adaptability allows 392 00:25:27,960 --> 00:25:31,328 these wandering sharks to use more waterways 393 00:25:31,364 --> 00:25:34,798 where they encounter people. 394 00:25:34,834 --> 00:25:37,268 George: The bull shark likes to live in the areas 395 00:25:37,303 --> 00:25:39,336 where we like to go in the water. 396 00:25:39,372 --> 00:25:43,607 So, as a result, the number of attacks involving bull sharks 397 00:25:43,643 --> 00:25:45,843 is pretty high, 398 00:25:45,878 --> 00:25:50,748 and the results can be quite catastrophic. 399 00:25:50,783 --> 00:25:52,383 (scream) 400 00:25:52,418 --> 00:25:53,551 mike: When people think about sharks, 401 00:25:53,586 --> 00:25:56,287 they tend to think about deep water. 402 00:25:56,322 --> 00:25:58,956 But some of these predators get into really shallow waters. 403 00:25:58,991 --> 00:26:00,457 Bull sharks will hunt in water 404 00:26:00,493 --> 00:26:05,696 that looks like it's just barely deep enough for them to swim in. 405 00:26:05,731 --> 00:26:08,599 That's where prey are found, and when you lock on to it, 406 00:26:08,634 --> 00:26:11,735 the prey has less dimensions to try to escape. 407 00:26:14,373 --> 00:26:15,806 Narrator: Bull sharks don't just live 408 00:26:15,841 --> 00:26:19,610 in the world's tropical oceans. 409 00:26:19,645 --> 00:26:23,280 The bull shark's invasion into freshwater expands its range 410 00:26:23,316 --> 00:26:25,382 beyond that of other sharks, 411 00:26:25,418 --> 00:26:28,986 to rivers, lakes, and freshwater streams. 412 00:26:32,592 --> 00:26:33,924 Man: Oh! 413 00:26:33,960 --> 00:26:36,727 Mike: Bull sharks get found in what are amazing places 414 00:26:36,762 --> 00:26:38,295 to people all around the world. 415 00:26:38,331 --> 00:26:40,864 You've got populations in lake nicaragua, 416 00:26:40,900 --> 00:26:43,801 they probably live there their whole life there. 417 00:26:43,836 --> 00:26:47,104 Couple thousand miles up the amazon river. 418 00:26:47,139 --> 00:26:49,707 Heck, in northern australia, they had some bull sharks 419 00:26:49,742 --> 00:26:53,510 that were living for a fairly long time in a golf course pond 420 00:26:53,546 --> 00:26:56,880 after they'd gotten swept in in a flood. 421 00:26:56,916 --> 00:26:59,683 The zambezi river in south africa, 422 00:26:59,719 --> 00:27:03,220 where you have animals that are 12, 13 feet long, 423 00:27:03,255 --> 00:27:06,624 just huge predators. 424 00:27:06,659 --> 00:27:09,793 Narrator: Here in south africa, 425 00:27:09,829 --> 00:27:12,730 bull sharks aren't afraid to spar with creatures 426 00:27:12,765 --> 00:27:15,099 more than twice their size. 427 00:27:20,706 --> 00:27:22,573 Narrator: The estuaries of south africa's 428 00:27:22,608 --> 00:27:24,942 isimangaliso wetland park 429 00:27:24,977 --> 00:27:28,312 support some of the world's most imposing creatures. 430 00:27:30,182 --> 00:27:31,515 Elephants, 431 00:27:31,550 --> 00:27:32,983 black rhinos, 432 00:27:33,019 --> 00:27:35,352 nile crocodiles, 433 00:27:35,388 --> 00:27:37,154 and hippos. 434 00:27:42,294 --> 00:27:44,395 Upriver from the indian ocean, 435 00:27:44,430 --> 00:27:47,765 10 massive adult hippos take a swim. 436 00:27:51,103 --> 00:27:53,671 Then notice an intruder. 437 00:27:55,875 --> 00:27:58,075 Mike: If there's an animal in africa not to mess with, 438 00:27:58,110 --> 00:27:59,576 hippos are right at the top. 439 00:27:59,612 --> 00:28:02,346 But, you know, this shark is just kind of swimming around 440 00:28:02,381 --> 00:28:04,982 and checking out hippos. 441 00:28:06,619 --> 00:28:07,985 Narrator: Hippos kill more humans 442 00:28:08,020 --> 00:28:11,955 than any other african animal. 443 00:28:11,991 --> 00:28:16,126 This smaller bull shark isn't fazed by their size. 444 00:28:18,664 --> 00:28:21,331 Mike: You can see the shark just kind of circling around here 445 00:28:21,367 --> 00:28:26,470 and the hippos are definitely keeping an eye on this shark. 446 00:28:26,505 --> 00:28:31,141 ♪ ♪ 447 00:28:31,177 --> 00:28:37,848 ♪ ♪ 448 00:28:37,883 --> 00:28:41,685 narrator: Suddenly, the shark makes a bold, aggressive move. 449 00:28:47,393 --> 00:28:50,561 But moves on when the hippos gang up. 450 00:28:53,899 --> 00:28:55,532 Mike: This is incredible. 451 00:28:55,568 --> 00:28:58,769 You would never expect to see bull sharks and hippos, 452 00:28:58,804 --> 00:29:02,906 but you do because those sharks can get into freshwater. 453 00:29:06,879 --> 00:29:09,480 Narrator: Signs of the bull shark are found in rivers 454 00:29:09,515 --> 00:29:15,085 all around the world, including the united states. 455 00:29:15,121 --> 00:29:18,622 ♪ ♪ 456 00:29:18,657 --> 00:29:22,893 ♪ ♪ 457 00:29:22,928 --> 00:29:26,864 for the past 40 years, waterman john "willy" dean 458 00:29:26,899 --> 00:29:29,099 has made his living fishing the tidal waters 459 00:29:29,135 --> 00:29:33,170 of the potomac river, a mile from the chesapeake bay. 460 00:29:35,741 --> 00:29:39,676 Every morning, he checks his nets for menhaden, croakers, 461 00:29:39,712 --> 00:29:43,614 and anything else that swims in. 462 00:29:43,649 --> 00:29:44,915 Willy: It's like a grab bag. 463 00:29:44,950 --> 00:29:47,518 You never know what you're going to have. 464 00:29:47,553 --> 00:29:50,220 That's what makes it so interesting. 465 00:29:50,256 --> 00:29:51,655 Just hold her there, greg. 466 00:29:51,690 --> 00:29:53,257 Greg: I'm holding it. 467 00:29:53,292 --> 00:29:54,424 Willy: A lot of crabs in there. 468 00:29:54,460 --> 00:29:56,994 Greg: Mm-hm. 469 00:29:57,029 --> 00:30:00,464 Narrator: On a routine haul in August 2013, 470 00:30:00,499 --> 00:30:04,535 willy and his son greg pull up the catch of their lives. 471 00:30:07,540 --> 00:30:10,073 Willy: We were coming out to fish the net that day, 472 00:30:10,109 --> 00:30:14,178 doing just what we're doing now, 473 00:30:14,213 --> 00:30:19,049 and when we got pulling this side up here, 474 00:30:19,084 --> 00:30:22,019 we noticed some thrashing in the water. 475 00:30:22,054 --> 00:30:25,923 And I told the boys, I said, "we got something in here today. 476 00:30:25,958 --> 00:30:27,925 And it ain't little." 477 00:30:30,396 --> 00:30:34,331 as we started getting the net up, we got a glimpse of it. 478 00:30:34,366 --> 00:30:37,801 And we realized we had a shark in here. 479 00:30:42,208 --> 00:30:45,909 First thing I think is, how can I get him out of this net 480 00:30:45,945 --> 00:30:50,681 as quick as possible, so he doesn't eat the net up? 481 00:30:50,716 --> 00:30:55,285 He would hit the net so hard he was shaking the poles. 482 00:30:55,321 --> 00:30:59,122 His tail section, he was flipping! 483 00:30:59,158 --> 00:31:01,058 That's a lot of power. 484 00:31:01,093 --> 00:31:04,862 Don't want to let your guard down. 485 00:31:04,897 --> 00:31:07,130 Narrator: Just when the shark is under control, 486 00:31:07,166 --> 00:31:11,401 the deans notice they have another problem. 487 00:31:11,437 --> 00:31:13,270 Greg: As we were pulling the one in the boat, 488 00:31:13,305 --> 00:31:16,039 we saw the second one. 489 00:31:16,075 --> 00:31:18,075 We all looked at each other and realized, yo, hey, 490 00:31:18,110 --> 00:31:20,244 we got to get ready to get this second one now, too. 491 00:31:25,784 --> 00:31:30,954 I weigh about 225, and, yeah, it was a struggle that day. 492 00:31:30,990 --> 00:31:35,659 The tail was pretty scary because of the force behind it. 493 00:31:35,694 --> 00:31:38,962 The entire time, all we heard was just him chomping his jaws. 494 00:31:41,233 --> 00:31:43,967 Narrator: Each bull is over 8 feet 495 00:31:44,003 --> 00:31:48,171 and weighs in at 300 pounds. 496 00:31:48,207 --> 00:31:49,740 Greg: I never would imagine to think there would be one 497 00:31:49,775 --> 00:31:52,175 right here, so close, you know, where I grew up at. 498 00:31:52,211 --> 00:31:54,578 Never in a million years would have thought it. 499 00:31:56,448 --> 00:31:58,749 Narrator: Two enormous bull sharks. 500 00:31:58,784 --> 00:32:02,486 Not in the ocean, but up a freshwater river, 501 00:32:02,521 --> 00:32:05,455 just a quick swim from beachgoers. 502 00:32:07,359 --> 00:32:12,162 Willy: This is where everybody comes to go swimming. 503 00:32:12,197 --> 00:32:16,333 This park is usually packed. 504 00:32:16,368 --> 00:32:20,437 I don't think they realize that the sharks are here. 505 00:32:22,441 --> 00:32:26,376 Kind of makes you reluctant to want to go swimming very much. 506 00:32:29,315 --> 00:32:30,647 Narrator: Since the deans pulled in 507 00:32:30,683 --> 00:32:34,384 their two bull sharks, scientists have recorded 508 00:32:34,420 --> 00:32:38,488 other bull shark sightings along the chesapeake. 509 00:32:38,524 --> 00:32:39,790 Charles: In the chesapeake bay, 510 00:32:39,825 --> 00:32:41,625 most of the bull sharks that are sighted, 511 00:32:41,660 --> 00:32:42,759 particularly in the potomac river, 512 00:32:42,795 --> 00:32:44,194 tend to be very large individuals, 513 00:32:44,229 --> 00:32:46,730 8 or 9 feet or greater. 514 00:32:46,765 --> 00:32:49,566 Narrator: There's a good reason why bull sharks head inland 515 00:32:49,601 --> 00:32:52,469 up waterways like this. 516 00:32:52,504 --> 00:32:54,771 And it's not for prey. 517 00:32:54,807 --> 00:32:58,108 The sharks are here to make more sharks. 518 00:33:03,082 --> 00:33:05,782 Narrator: Each year, the waterways of the southern united states 519 00:33:05,818 --> 00:33:08,785 get some dangerous visitors: 520 00:33:08,821 --> 00:33:11,788 Bull sharks... 521 00:33:11,824 --> 00:33:12,923 Coming to breed. 522 00:33:16,128 --> 00:33:17,728 Mike: A pregnant female bull shark 523 00:33:17,763 --> 00:33:20,030 will swim into coastal waters, 524 00:33:20,065 --> 00:33:22,332 maybe into the mouth of a river and estuary, 525 00:33:22,368 --> 00:33:24,668 and she'll have her pups. 526 00:33:24,703 --> 00:33:28,972 Those pups have been growing inside her for about a year. 527 00:33:29,008 --> 00:33:32,075 Narrator: Bulls give birth to around eight pups per litter 528 00:33:32,111 --> 00:33:35,312 in the safety of these nurseries. 529 00:33:35,347 --> 00:33:38,315 George: By definition, nursery areas are rich in food 530 00:33:38,350 --> 00:33:40,984 so the young can grow. 531 00:33:41,020 --> 00:33:45,689 And they also are areas where the danger is lower 532 00:33:45,724 --> 00:33:49,993 of being eaten by larger predators. 533 00:33:50,029 --> 00:33:56,266 ♪ ♪ 534 00:33:56,301 --> 00:33:59,269 narrator: River fish expert and national geographic explorer 535 00:33:59,304 --> 00:34:02,773 zeb hogan has traveled to australia's outback 536 00:34:02,808 --> 00:34:07,878 to see if he can find proof of baby bulls in freshwater. 537 00:34:07,913 --> 00:34:10,981 Zeb: We're at our fishing spot and what a nice spot to fish! 538 00:34:14,820 --> 00:34:17,754 Narrator: Zeb's daytime attempts are a bust. 539 00:34:20,192 --> 00:34:23,727 But after sundown, something shifts. 540 00:34:28,167 --> 00:34:30,667 Zeb: Oh, something pulling. 541 00:34:33,772 --> 00:34:35,972 It's coming towards us. 542 00:34:39,845 --> 00:34:41,878 Whoa! This is big, this is big! 543 00:34:41,914 --> 00:34:43,780 Whatever this is, it's big! 544 00:34:46,685 --> 00:34:49,186 It really was pulling line at the beginning there. 545 00:34:49,221 --> 00:34:51,188 I haven't seen it break the surface yet, 546 00:34:51,223 --> 00:34:54,791 but might be a shark! 547 00:34:54,827 --> 00:34:56,359 Little bull shark! 548 00:34:56,395 --> 00:34:59,963 Man, long time coming, finally got one. 549 00:34:59,998 --> 00:35:01,665 Look at this thing! 550 00:35:04,303 --> 00:35:05,836 Wow! 551 00:35:05,871 --> 00:35:12,742 ♪ ♪ 552 00:35:12,778 --> 00:35:17,214 small bull shark, probably about a meter long. 553 00:35:17,249 --> 00:35:21,151 World record size would be about 800 to 1,000 pounds. 554 00:35:21,186 --> 00:35:24,154 So, this is a very young shark. 555 00:35:24,156 --> 00:35:28,592 Narrator: Zeb has discovered a bull shark nursery. 556 00:35:28,627 --> 00:35:32,929 One day the babies here may threaten swimmers far away. 557 00:35:35,267 --> 00:35:37,334 Mike: They'll be in these freshwater systems 558 00:35:37,369 --> 00:35:40,237 for maybe three to five years. 559 00:35:40,272 --> 00:35:43,073 Then once they're big enough, they'll leave the river systems 560 00:35:43,108 --> 00:35:45,609 and start living in coastal waters. 561 00:35:48,881 --> 00:35:50,914 Narrator: Bull sharks have always lived in rivers 562 00:35:50,949 --> 00:35:54,718 and close to the coast. 563 00:35:54,753 --> 00:35:58,021 A bull shark may have been responsible for a string 564 00:35:58,056 --> 00:36:01,091 of the deadliest inland attacks in history. 565 00:36:02,895 --> 00:36:04,394 Mike: You had so many attacks clustered 566 00:36:04,429 --> 00:36:06,563 in such a short period of time, 567 00:36:06,598 --> 00:36:10,000 that started to get the public perception of sharks 568 00:36:10,035 --> 00:36:15,605 as dangerous, and ultimately was an inspiration for jaws. 569 00:36:15,641 --> 00:36:16,973 (scream) 570 00:36:21,079 --> 00:36:23,547 narrator: More than a hundred years ago, 571 00:36:23,582 --> 00:36:27,217 shark attacks were virtually unknown in america. 572 00:36:28,787 --> 00:36:31,588 George: At that time, there was a school of thought 573 00:36:31,623 --> 00:36:35,492 that sharks don't attack humans. 574 00:36:35,527 --> 00:36:39,863 In fact, a person put a high reward out for anybody 575 00:36:39,898 --> 00:36:43,500 who could prove that sharks attack humans. 576 00:36:47,739 --> 00:36:51,608 Narrator: July 1, 1916. 577 00:36:51,643 --> 00:36:57,247 Just off the coast of long beach island, new jersey, 578 00:36:57,282 --> 00:37:01,818 a shark attacks and kills 25-year-old charles vansant. 579 00:37:06,158 --> 00:37:09,693 Five days later and 45 miles north, 580 00:37:09,728 --> 00:37:15,599 27-year-old charles bruder is attacked not far from shore. 581 00:37:15,667 --> 00:37:19,536 His abdomen is ripped open and both legs are severed. 582 00:37:23,208 --> 00:37:25,575 The unprecedented back-to-back killings 583 00:37:25,611 --> 00:37:27,944 leave the public shaken. 584 00:37:30,148 --> 00:37:35,218 Eleven days later, there's a third attack, 585 00:37:35,254 --> 00:37:38,989 but not in the atlantic ocean. 586 00:37:39,024 --> 00:37:41,424 Matawan creek, new jersey. 587 00:37:41,460 --> 00:37:44,628 15 miles inland from the jersey shore. 588 00:37:47,399 --> 00:37:50,600 A group of boys are playing 589 00:37:50,636 --> 00:37:54,904 when a shark grabs 11-year-old lester stilwell 590 00:37:54,940 --> 00:37:57,507 and pulls him under. 591 00:37:57,542 --> 00:37:58,575 (screams) 592 00:38:04,316 --> 00:38:08,985 a good samaritan tries to recover the body. 593 00:38:09,021 --> 00:38:11,688 But a shark kills him, too. 594 00:38:13,659 --> 00:38:18,361 30 minutes later, a shark attacks another boy. 595 00:38:18,397 --> 00:38:21,931 This teen manages to escape with his life. 596 00:38:24,503 --> 00:38:26,936 Mike: One of the things that to me is really interesting 597 00:38:26,972 --> 00:38:30,273 about the 1916 attacks in new jersey 598 00:38:30,309 --> 00:38:34,411 is the attacks that occurred so far upstream. 599 00:38:34,446 --> 00:38:36,746 That's the kind of habitat you wouldn't really think 600 00:38:36,782 --> 00:38:38,148 a great white would be in. 601 00:38:38,183 --> 00:38:41,017 I mean, that seems more like a bull shark. 602 00:38:43,922 --> 00:38:47,157 Narrator: The river attacks in new jersey were lethal... 603 00:38:47,192 --> 00:38:48,658 But rare. 604 00:38:50,629 --> 00:38:52,395 In another part of the world, 605 00:38:52,431 --> 00:38:56,333 people risk their lives every time they enter the water. 606 00:39:03,375 --> 00:39:05,875 Narrator: The ganges river basin, 607 00:39:05,911 --> 00:39:08,111 west bengal, india. 608 00:39:10,515 --> 00:39:13,817 For many of the 400 million people living here, 609 00:39:13,852 --> 00:39:13,917 the murky river is an important source of income. 610 00:39:20,258 --> 00:39:24,160 It also holds a danger: 611 00:39:24,196 --> 00:39:26,896 Bull sharks. 612 00:39:26,932 --> 00:39:29,766 Mike: When you see a big bull shark in the caribbean 613 00:39:29,801 --> 00:39:33,336 or the atlantic, they are big, impressive predators, 614 00:39:33,372 --> 00:39:35,271 but get over to the indian ocean, 615 00:39:35,307 --> 00:39:40,243 and they get three feet longer and way more massive. 616 00:39:40,278 --> 00:39:43,213 So, you get from an impressive predator 617 00:39:43,248 --> 00:39:47,917 to a truly amazing apex predator. 618 00:39:52,657 --> 00:39:56,259 Narrator: The sharks clash with humans in these river systems. 619 00:40:01,400 --> 00:40:05,769 And leave their signatures on the unlucky. 620 00:40:05,804 --> 00:40:10,640 George: Victims oftentimes reach down and go to try to defend 621 00:40:10,675 --> 00:40:12,842 themselves from whatever is biting them. 622 00:40:12,878 --> 00:40:16,279 And in doing so, they often get defensive wounds. 623 00:40:16,314 --> 00:40:20,517 And they're analogous to what we see in stabbing incidents 624 00:40:20,552 --> 00:40:26,656 where the victim reaches out to defend themselves. 625 00:40:26,691 --> 00:40:32,262 If one examines the wounds, one often can find telltale signs 626 00:40:32,297 --> 00:40:34,964 that a bull shark has attacked. 627 00:40:35,000 --> 00:40:37,967 The serrated teeth often lead to injuries 628 00:40:38,003 --> 00:40:42,939 on particularly the long bones of the leg or arm. 629 00:40:42,974 --> 00:40:44,941 And as the tooth hits the bone, 630 00:40:44,976 --> 00:40:48,311 it leaves very distinctive serrated marks. 631 00:40:52,284 --> 00:40:55,919 Narrator: Now you understand the power of the bull shark, 632 00:40:55,954 --> 00:40:57,720 beware. 633 00:40:57,756 --> 00:41:01,090 There's more chance than ever you'll encounter one. 634 00:41:05,297 --> 00:41:07,163 Charles: There are a number of nursery habitats for bull sharks 635 00:41:07,199 --> 00:41:09,399 that have been identified in us waters. 636 00:41:09,434 --> 00:41:11,000 A lot of them are in the gulf of mexico, 637 00:41:11,036 --> 00:41:13,503 ranging from texas up to louisiana, 638 00:41:13,538 --> 00:41:15,071 over to western florida. 639 00:41:15,106 --> 00:41:16,906 On the east coast, probably the most heavily used 640 00:41:16,941 --> 00:41:19,275 nursery habitat is the indian river lagoon 641 00:41:19,311 --> 00:41:22,111 that stretches along a lot of the east coast of florida. 642 00:41:22,147 --> 00:41:24,981 And more recently, there have been an increasing number 643 00:41:25,016 --> 00:41:28,017 of juveniles born in pamlico sound, north carolina. 644 00:41:30,989 --> 00:41:35,091 Narrator: Bull sharks favor the tropics. 645 00:41:35,126 --> 00:41:37,026 And climate change is inviting them 646 00:41:37,062 --> 00:41:39,529 to more waterways than ever. 647 00:41:42,067 --> 00:41:44,100 They're on the move. 648 00:41:45,670 --> 00:41:49,739 Mike: Climate change is going to affect the oceans profoundly. 649 00:41:49,774 --> 00:41:53,076 As waters warm, what that's going to do is expand the range 650 00:41:53,111 --> 00:41:55,912 over which a lot of tropical species can live. 651 00:41:55,947 --> 00:41:58,815 So, animals like bull sharks that like warm water, 652 00:41:58,850 --> 00:42:00,250 they're going to be able to move 653 00:42:00,285 --> 00:42:01,784 into those higher latitude areas. 654 00:42:01,820 --> 00:42:04,487 They're going to be able to move north along the us coast 655 00:42:04,523 --> 00:42:08,691 as the conditions become more favorable. 656 00:42:08,727 --> 00:42:10,026 Narrator: As that happens, 657 00:42:10,061 --> 00:42:13,897 swimmers off the northeast coast may soon see 658 00:42:13,932 --> 00:42:16,766 two apex predators in their waters. 659 00:42:19,004 --> 00:42:22,171 George: We're going to be seeing the bull shark range impinging 660 00:42:22,207 --> 00:42:25,742 on what was traditional white shark territory. 661 00:42:27,445 --> 00:42:28,778 More humans in the water, 662 00:42:28,813 --> 00:42:31,614 more sharks in those particular waters 663 00:42:31,650 --> 00:42:34,584 is a formula for more bites. 664 00:42:38,290 --> 00:42:40,690 Narrator: It seems we're already seeing the signs 665 00:42:40,725 --> 00:42:44,160 of increased activity. 666 00:42:44,195 --> 00:42:46,296 George: Anybody who spends time in the seas, 667 00:42:46,331 --> 00:42:48,998 in certain areas have had a shark 668 00:42:49,034 --> 00:42:52,035 within 6 to 10 feet of them at one time or another, 669 00:42:52,070 --> 00:42:53,870 without knowing it. 670 00:42:58,209 --> 00:43:01,778 Realistically, we're going to see more shark bites 671 00:43:01,813 --> 00:43:04,147 from the bull shark in years ahead, 672 00:43:04,182 --> 00:43:07,750 as long as we don't contain the climate change. 673 00:43:11,323 --> 00:43:14,023 Narrator: Powerful... 674 00:43:14,059 --> 00:43:16,259 Stealthy... 675 00:43:16,294 --> 00:43:18,494 Adaptable... 676 00:43:18,530 --> 00:43:21,264 And aggressive... 677 00:43:21,299 --> 00:43:23,299 With a deadly bite. 678 00:43:26,705 --> 00:43:29,672 The bull shark swims where we do. 679 00:43:32,510 --> 00:43:34,677 If you get into the water, 680 00:43:34,713 --> 00:43:39,148 you do so at your own risk. 681 00:43:39,184 --> 00:43:40,583 (scream) 682 00:43:40,619 --> 00:43:43,286 george: The sea does not belong to us. 683 00:43:43,321 --> 00:43:45,722 It's a wilderness experience. 684 00:43:45,757 --> 00:43:48,958 As you enter the sea, you're an ecotourist. 685 00:43:48,994 --> 00:43:51,928 You need to understand there's risk. 686 00:43:51,963 --> 00:43:54,130 Mike: If you see bull sharks in the water, 687 00:43:54,165 --> 00:43:56,833 I would suggest getting out. 688 00:43:56,868 --> 00:43:58,434 I'm getting out! 689 00:44:01,606 --> 00:44:04,040 (muffled scream) 690 00:44:04,075 --> 00:44:05,975 captioned by side door media services 59558

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