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David Attenborough:\NDWARFED BY THE VAST EXPANSE
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OF THE OPEN OCEAN,
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THE BIGGEST ANIMAL THAT HAS EVER\NLIVED ON OUR PLANET.
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A BLUE WHALE, 30 METERS LONG\NAND WEIGHING OVER 200 TONS.
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IT'S FAR BIGGER\NTHAN EVEN THE BIGGEST DINOSAUR.
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ITS TONGUE WEIGHS\NAS MUCH AS AN ELEPHANT.
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ITS HEART IS THE SIZE OF A CAR,
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AND SOME OF ITS BLOOD VESSELS\NARE SO WIDE
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THAT YOU COULD SWIM DOWN THEM.
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ITS TAIL ALONE IS THE WIDTH\NOF A SMALL AIRCRAFT'S WINGS.
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ITS STREAMLINING,\NCLOSE TO PERFECTION,
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ENABLES IT TO CRUISE\NAT 20 KNOTS.
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IT'S ONE OF THE FASTEST ANIMALS\NIN THE SEA.
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THE OCEAN'S LARGEST INHABITANT
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FEEDS ALMOST EXCLUSIVELY\NON ONE OF THE SMALLEST --
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KRILL, A CRUSTACEAN\NJUST A FEW CENTIMETERS LONG.
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GATHERED IN A SHOAL,
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KRILL STAIN THE SEA RED,
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AND A SINGLE BLUE WHALE IN A DAY\NCAN CONSUME 40 MILLION OF THEM.
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DESPITE THE ENORMOUS SIZE\NOF BLUE WHALES,
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WE KNOW VERY LITTLE ABOUT THEM.
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THEIR MIGRATION ROUTES\NARE STILL A MYSTERY,
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AND WE HAVE ABSOLUTELY NO IDEA\NWHERE THEY GO TO BREED.
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THEY ARE A DRAMATIC REMINDER
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OF HOW MUCH WE STILL HAVE\NTO LEARN ABOUT THE OCEAN
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AND THE CREATURES\NTHAT LIVE THERE.
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OUR PLANET IS A BLUE PLANET.
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OVER 70 PERCENT OF IT\NIS COVERED BY THE SEA.
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THE PACIFIC OCEAN ALONE\NCOVERS HALF THE GLOBE.
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YOU CAN FLY ACROSS IT NON-STOP\NFOR 12 HOURS
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AND STILL SEE NOTHING MORE\NTHAN A SPECK OF LAND.
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THIS SERIES WILL REVEAL
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THE COMPLETE NATURAL HISTORY\NOF OUR OCEAN PLANET
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FROM ITS FAMILIAR SHORES
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TO THE MYSTERIES\NOF ITS DEEPEST SEAS.
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BY VOLUME,
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THE OCEAN MAKES UP\N97 PERCENT
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OF THE EARTH'S\NINHABITABLE SPACE,
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AND THE SHEER QUANTITY\NOF MARINE LIFE IT CONTAINS
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FAR EXCEEDS THAT\NWHICH INHABITS THE LAND.
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BUT LIFE IN THE OCEAN IS NOT\NEVENLY SPREAD.
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IT'S REGULATED
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BY THE PATH OF CURRENTS\NCARRYING NUTRIENTS,
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AND THE VARYING POWER\NOF THE SUN.
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IN THIS FIRST PROGRAM,\NWE WILL SEE
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HOW THESE TWO FORCES INTERACT
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TO CONTROL THE DISTRIBUTION\NOF LIFE
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FROM THE CORAL SEAS\NTO THE POLAR WASTES.
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THE SHEER PHYSICAL POWER\NOF THE OCEAN
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DOMINATES OUR PLANET.
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IT PROFOUNDLY INFLUENCES\NTHE WEATHER OF ALL THE WORLD.
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WATER VAPOR RISING FROM IT\NFORMS THE CLOUDS
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AND GENERATES THE STORMS
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THAT ULTIMATELY\NWILL DRENCH THE LAND.
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THE GREAT WAVES THAT ROAR IN\NTOWARDS THE SHORES
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ARE DRAMATIC DEMONSTRATIONS\NOF ITS POWER.
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WAVES ORIGINATE FAR OUT AT SEA.
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THERE, EVEN GENTLE BREEZES\NCAN CAUSE RIPPLES,
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AND RIPPLES GROW INTO SWELLS.
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OUT IN THE OPEN OCEAN,\NUNIMPEDED BY LAND,
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SUCH SWELLS CAN BECOME GIGANTIC.
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IT'S ONLY WHEN AN OCEAN SWELL\NEVENTUALLY REACHES SHALLOW WATER
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THAT IT STARTS TO BREAK.
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AS IT APPROACHES THE COAST,
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THE WATER AT THE BOTTOM\NOF THE SWELL
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IS SLOWED BY CONTACT\NWITH THE SEABED.
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THE TOP OF THE SWELL,\NSTILL TRAVELING FAST,
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STARTS TO ROLL OVER,
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AND SO THE WAVE BREAKS.
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THE OCEAN NEVER RESTS.
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HUGE CURRENTS,\NSUCH AS THE GULF STREAM,
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KEEP ITS WATERS CONSTANTLY\NON THE MOVE ALL ROUND THE GLOBE.
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IT'S THESE CURRENTS,\NMORE THAN ANY OTHER FACTOR,
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THAT CONTROL THE DISTRIBUTION\NOF NUTRIENTS
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AND LIFE IN THE SEAS.
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A TINY ISLAND LOST\NIN THE MIDST OF THE PACIFIC.
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IT'S THE TIP OF A HUGE MOUNTAIN
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THAT RISES PRECIPITOUSLY\NFROM THE SEA FLOOR
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THOUSANDS OF METERS BELOW.
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THE NEAREST LAND\NIS 300 MILES AWAY.
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ISOLATED SEAMOUNTS\NLIKE THIS ONE
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CREATE OASES\NWHERE LIFE CAN FLOURISH
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IN THE COMPARATIVELY EMPTY\NEXPANSES OF THE OPEN OCEAN.
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BUT ALL THE CREATURES THAT SWIM\NBESIDE IT WOULD NOT BE HERE
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WERE IT NOT\NFOR ONE KEY FACTOR --
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THE DEEP OCEAN CURRENTS.
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FAR BELOW THE SURFACE, THEY\NCOLLIDE WITH THE ISLAND'S FLANKS
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AND ARE DEFLECTED UPWARDS,
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BRINGING WITH THEM\NFROM THE DEPTHS
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A RICH SOUP OF NUTRIENTS.
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SUCH UPWELLINGS ATTRACT\NGREAT CONCENTRATIONS OF LIFE.
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MOST OF THE FISH HERE\NARE PERMANENT RESIDENTS
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FEEDING ON THE PLANKTON --
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THE TINY\NFLOATING PLANTS AND ANIMALS
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THAT ARE NOURISHED\NBY THE RICHNESS
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BROUGHT UP FROM THE DEPTHS --
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AND THEY IN TURN ATTRACT\NVISITORS FROM THE OPEN OCEAN.
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TUNA.
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THE PLANKTON FEEDERS\NARE EASY TARGETS.
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ALL THIS ACTION ATTRACTS\NEVEN LARGER PREDATORS.
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SHARKS.
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HUNDREDS OF SHARKS.
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THESE SILKY SHARKS ARE NORMALLY\NOCEAN-GOING SPECIES,
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BUT THE SEAMOUNTS\NIN THE EASTERN PACIFIC,
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LIKE COCOS, MAPELO,\NAND THE GALAPAGOS,
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ATTRACT SILKIES IN HUGE GROUPS
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UP TO 500 STRONG.
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SILKIES SEEM TO SPECIALIZE\NIN TAKING INJURED FISH
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AND CONSTANTLY CIRCLE SEAMOUNTS
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ON THE LOOKOUT FOR THE CHANCE\NTO DO SO.
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00:11:32,990 --> 00:11:35,520
BUT SILKIES ARE NOT\NTHE ONLY VISITORS.
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HAMMERHEADS GATHER IN SOME OF\NTHE LARGEST SHARK SHOALS
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TO BE FOUND\NANYWHERE IN THE OCEAN.
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SOMETIMES, THOUSANDS WILL CIRCLE\NOVER A SINGLE SEAMOUNT.
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BUT THESE SHARKS ARE NOT HERE\NFOR FOOD.
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THEY HAVE COME\NFOR ANOTHER REASON.
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SOME OF THE LOCALS\NPROVIDE A CLEANING SERVICE.
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FOLLOWING THE LAST EL NIÑO YEAR,
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WHEN A RISE\NIN WATER TEMPERATURES
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CAUSED MANY SHARKS TO SUFFER\NFROM FUNGAL INFECTIONS,
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THE NUMBER OF HAMMERHEADS\NVISITING THE SEAMOUNTS
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REACHED RECORD LEVELS.
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Attenborough: NUTRIENTS ALSO\NWELL UP TO THE SURFACE
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ALONG THE COASTS\NOF THE CONTINENTS.
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THIS IS NATAL ON SOUTH AFRICA'S\NEASTERN SEABOARD.
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IT'S JUNE,\NAND JUST OFF-SHORE,
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STRANGE BLACK PATCHES\NHAVE APPEARED.
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THEY LOOK LIKE IMMENSE\NOIL SLICKS UP TO A MILE LONG.
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BUT THIS IS A LIVING SLICK --
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MILLIONS AND MILLIONS
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OF SARDINES\NON A MARINE MIGRATION
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THAT, IN TERMS OF SHEER BIOMASS,
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RIVALS THAT OF THE WILDEBEEST\NON THE GRASSLANDS OF AFRICA.
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THESE FISH LIVE\NFOR MOST OF THE TIME
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IN THE COLD WATERS\NSOUTH OF THE CAPE,
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BUT EACH YEAR\NTHE COASTAL CURRENTS REVERSE.
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THE WARM AGULHAS CURRENT
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THAT USUALLY FLOWS DOWN\NFROM THE NORTH
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HAS BEEN DISPLACED BY COLD WATER\NCOMING UP FROM THE SOUTH,
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AND THAT HAS BROUGHT UP\NRICH NUTRIENTS.
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THEY IN TURN HAVE CREATED\NA BLOOM OF PLANKTON,
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AND THE SARDINES\NARE NOW FEASTING ON IT.
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AS THE SARDINES TRAVEL NORTH,
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A WHOLE CARAVAN OF PREDATORS\NFOLLOW THEM.
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THOUSANDS OF CAPE GANNETS\NTRACK THE SARDINES.
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THEY NESTED OFF THE CAPE\NAND TIMED THEIR BREEDING
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SO THAT THEIR NEWLY FLEDGED\NCHICKS CAN JOIN THEM
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IN PURSUING THE SHOALS.
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BELOW WATER, HUNDREDS OF SHARKS\NHAVE ALSO JOINED THE CARAVAN.
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THESE ARE BRONZE WHALER SHARKS,
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A COLD-WATER SPECIES\NTHAT NORMALLY LIVES
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MUCH FURTHER SOUTH.
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THESE THREE-METER SHARKS
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CUT SUCH GREAT SWATHES\NTHROUGH THE SARDINE SHOALS
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THAT THEIR TRACKS ARE CLEARLY\NVISIBLE FROM THE AIR.
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HARRIED BY PACKS OF PREDATORS
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AND SWEPT IN\NBY THE ACTION OF THE WAVES,
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THE SARDINE SHOALS ARE PENNED\NCLOSE TO THE SHORE.
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COMMON DOLPHIN ARE COMING IN\NFROM THE OPEN OCEAN
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TO JOIN THE FEAST.
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THERE ARE OVER A THOUSAND\NOF THEM
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IN THIS ONE SCHOOL.
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WHEN THEY CATCH UP\NWITH THE SARDINES,
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THE ACTION REALLY BEGINS.
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WORKING TOGETHER, THEY DRIVE\NTHE SHOAL TOWARDS THE SURFACE.
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IT'S EASIER FOR THE DOLPHINS\NTO SNATCH FISH UP HERE.
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NOW THE SARDINES HAVE NO ESCAPE.
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THANKS TO THE DOLPHINS,
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THE SARDINES HAVE COME WITHIN\NTHE DIVING RANGE OF THE GANNETS.
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HUNDREDS OF WHITE ARROWS\NSHOOT INTO THE SEA,
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LEAVING LONG TRAILS OF BUBBLES\NBEHIND EACH DIVE.
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NEXT TO JOIN THE FRENZY\NARE THE SHARKS.
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SHARKS GET VERY EXCITED\NWHEN DOLPHINS ARE AROUND.
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THAT MAY BE BECAUSE THEY\NCAN FEED PARTICULARLY WELL
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ONCE THE DOLPHINS\NHAVE DRIVEN THE SARDINES
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INTO MORE COMPACT GROUPS\NNEAR THE SURFACE.
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00:17:36,920 --> 00:17:39,410
AS THE FRENZY CONTINUES,
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WALLS OF BUBBLES DRIFT UPWARDS.
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00:17:44,350 --> 00:17:46,810
THEY ARE BEING RELEASED\NBY THE DOLPHINS,
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WORKING TOGETHER IN TEAMS.
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00:17:51,330 --> 00:17:53,120
THEY USE THE BUBBLES
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TO CORRAL THE SARDINES\NINTO EVER TIGHTER GROUPS.
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THE SARDINES SELDOM CROSS\NTHE WALL OF BUBBLES
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AND CROWD CLOSER TOGETHER.
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00:18:08,130 --> 00:18:09,660
BUBBLE NETTING IN THIS WAY
186
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ENABLES THE DOLPHINS TO GRAB\NEVERY LAST TRAPPED SARDINE.
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JUST WHEN THE FEASTING\NSEEMS TO BE ALMOST OVER,
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A BRYDE'S WHALE.
189
00:18:34,370 --> 00:18:37,210
THE SURVIVORS HEAD ON\NNORTHWARDS,
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AND THE CARAVAN OF PREDATORS\NFOLLOWS THEM.
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00:18:46,470 --> 00:18:48,310
Attenborough: EVERY EVENING,
192
00:18:48,500 --> 00:18:50,310
THE DISAPPEARANCE\NOF THE SUN BELOW THE HORIZON
193
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TRIGGERS THE LARGEST\NMIGRATION OF LIFE
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THAT TAKES PLACE ON OUR PLANET.
195
00:19:02,480 --> 00:19:06,320
ONE THOUSAND MILLION TONS\NOF SEA CREATURES
196
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ASCEND FROM THE DEEP OCEAN
197
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TO SEARCH FOR FOOD\NNEAR THE SURFACE.
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00:19:17,800 --> 00:19:21,340
THEY GRAZE ON THE PHYTOPLANKTON\NUNDER COVER OF DARKNESS.
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EVEN SO, THEY ARE FAR FROM SAFE.
200
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OTHER MARINE HUNTERS\NFOLLOW THEM,
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SOME TRAVELING UP\NFROM HUNDREDS OF METERS BELOW.
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00:20:28,570 --> 00:20:32,190
AT DAWN,\NTHE WHOLE PROCESSION RETURNS
203
00:20:32,390 --> 00:20:34,530
TO THE SAFETY\NOF THE DARK DEPTHS.
204
00:20:37,320 --> 00:20:39,850
THE PACIFIC COAST OF COSTA RICA
205
00:20:40,050 --> 00:20:43,330
ON A VERY SPECIAL NIGHT.
206
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IT'S JUST AFTER MIDNIGHT,\NAND THE TIDE IS COMING IN.
207
00:20:50,330 --> 00:20:52,950
THE MOON IS IN ITS LAST QUARTER,
208
00:20:53,150 --> 00:20:57,250
EXACTLY HALFWAY\NBETWEEN FULL AND NEW.
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00:20:58,560 --> 00:21:01,180
FOR WEEKS,\NTHE BEACH HAS BEEN EMPTY,
210
00:21:01,380 --> 00:21:03,480
BUT THAT IS ABOUT TO CHANGE.
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00:21:03,680 --> 00:21:07,700
AT HIGH TIDE, TURTLES\NSTART TO EMERGE FROM THE SURF.
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00:21:11,920 --> 00:21:15,930
AT FIRST, THEY COME\NIN ONES AND TWOS,
213
00:21:16,130 --> 00:21:17,930
BUT WITHIN AN HOUR,
214
00:21:18,130 --> 00:21:21,620
THEY ARE APPEARING\NALL ALONG THE BEACH.
215
00:21:26,580 --> 00:21:29,940
THEY ARE ALL FEMALE\NRIDLEY'S TURTLES,
216
00:21:30,140 --> 00:21:31,470
AND OVER THE NEXT\NSIX DAYS OR SO,
217
00:21:31,670 --> 00:21:34,950
400,000 WILL VISIT\NTHIS ONE BEACH
218
00:21:35,150 --> 00:21:38,680
TO LAY THEIR EGGS IN THE SAND.
219
00:21:45,080 --> 00:21:49,530
AT THE PEAK TIME, 5,000\NARE COMING AND GOING EVERY HOUR.
220
00:21:49,730 --> 00:21:52,140
THE TOP OF THE BEACH\NGETS SO CROWDED
221
00:21:52,340 --> 00:21:54,930
THAT THEY HAVE TO CLAMBER\NOVER ONE ANOTHER
222
00:21:55,130 --> 00:21:56,100
TO FIND A BARE PATCH
223
00:21:56,300 --> 00:21:58,570
WHERE THEY CAN DIG A NEST HOLE.
224
00:22:02,450 --> 00:22:06,630
A QUARTER OF THE WORLD'S\NPOPULATION OF RIDLEY'S TURTLES
225
00:22:06,830 --> 00:22:10,900
COME TO THIS ONE BEACH\NON A FEW KEY NIGHTS EACH YEAR.
226
00:22:11,100 --> 00:22:12,900
THE REST OF THE TIME,
227
00:22:13,100 --> 00:22:14,290
THEY ARE WIDELY DISTRIBUTED\NTHROUGH THE OCEAN,
228
00:22:14,490 --> 00:22:16,690
SEARCHING FOR FOOD,
229
00:22:16,890 --> 00:22:18,910
MOST, HUNDREDS OF MILES AWAY\NFROM HERE.
230
00:22:19,110 --> 00:22:21,910
THIS MASS NESTING IS CALLED\NAN ARRIBADA.
231
00:22:22,110 --> 00:22:24,480
HOW IT'S COORDINATED\NIS A MYSTERY,
232
00:22:24,680 --> 00:22:27,790
BUT WE DO KNOW THAT ARRIBADAS\NSTART
233
00:22:27,980 --> 00:22:30,130
WHEN THE MOON IS EITHER IN\NITS FIRST OR ITS LAST QUARTER.
234
00:22:39,310 --> 00:22:43,240
FORTY MILLION EGGS ARE LAID\NIN JUST A FEW DAYS.
235
00:22:43,430 --> 00:22:46,930
BY SYNCHRONIZING THEIR NESTING\NIN THIS WAY, THE FEMALES ENSURE
236
00:22:47,130 --> 00:22:50,460
THAT SIX WEEKS LATER,\NTHEIR HATCHLINGS WILL EMERGE
237
00:22:50,660 --> 00:22:53,510
IN SUCH ENORMOUS NUMBERS\NTHAT PREDATORS ON THE BEACH
238
00:22:53,710 --> 00:22:54,860
ARE OVERWHELMED,
239
00:22:55,060 --> 00:22:57,550
AND A SIGNIFICANT PROPORTION\NOF THE BABY TURTLES
240
00:22:57,750 --> 00:22:59,940
WILL GET PAST THEM\NAND MAKE IT TO THE WATER.
241
00:23:02,640 --> 00:23:05,480
BUT WHY DO THE FEMALES\NUSE A CUE FROM THE MOON
242
00:23:05,670 --> 00:23:08,170
TO HELP IN SYNCHRONIZE\NTHEIR NESTING?
243
00:23:08,370 --> 00:23:10,480
PART OF THE ANSWER TO THAT
244
00:23:10,680 --> 00:23:13,390
BECOMES CLEAR AT DAWN\NON THE FOLLOWING MORNING.
245
00:23:34,360 --> 00:23:36,380
THE DAY SHIFT OF PREDATORS
246
00:23:36,580 --> 00:23:38,980
ARE ARRIVING\NFOR THEIR FIRST MEALS.
247
00:23:43,680 --> 00:23:47,040
VULTURES HAVE LEARNT\NTHAT THE RETURNING TIDE
248
00:23:47,240 --> 00:23:50,250
CAN WASH FRESHLY LAID EGGS\NOUT OF THE SAND.
249
00:23:51,690 --> 00:23:55,530
THE RISK OF EGGS' BEING EXPOSED\NBY THE SURF
250
00:23:55,720 --> 00:23:59,090
MAY BE PART OF THE REASON WHY\NTURTLE ARRIBADAS TEND TO OCCUR
251
00:23:59,290 --> 00:24:02,440
AROUND THE LAST OR FIRST QUARTER\NOF THE MOON.
252
00:24:05,400 --> 00:24:07,970
IT'S ON SUCH DAYS AS THIS,
253
00:24:08,170 --> 00:24:10,240
WHEN THE MOON IS NEITHER FULL\NNOR NEW,
254
00:24:10,430 --> 00:24:11,980
THAT THE TIDES ARE WEAKEST
255
00:24:12,180 --> 00:24:14,620
AND THE SEA IS LIKELY\NTO BE CALMER.
256
00:24:28,720 --> 00:24:32,130
SO AT THESE TIMES IT'S EASIER\NFOR THE FEMALE TURTLES
257
00:24:32,330 --> 00:24:33,560
TO MAKE THEIR WAY\NTHROUGH THE SURF,
258
00:24:33,760 --> 00:24:36,390
AND THERE'S LESS CHANCE OF THEIR\NEGGS' BEING WASHED
259
00:24:36,590 --> 00:24:39,080
OUT OF THE SAND\NAND BEING TAKEN BY THE VULTURES.
260
00:24:53,100 --> 00:24:54,800
Attenborough: THE SUN'S POSITION\NRELATIVE TO THE EARTH
261
00:24:55,000 --> 00:24:56,020
CHANGES THROUGH THE YEAR,
262
00:24:56,220 --> 00:24:59,020
AND IT'S THIS\NTHAT PRODUCES THE SEASONS.
263
00:24:59,220 --> 00:25:01,030
IN THE NORTH, SPRING COMES
264
00:25:01,220 --> 00:25:05,030
AS THE SUN BEGINS TO RISE\NHIGHER IN THE SKY.
265
00:25:05,230 --> 00:25:07,290
OFF THE COAST\NOF NORTHWEST AMERICA,
266
00:25:07,490 --> 00:25:09,030
THE SEAS ARE TRANSFORMED
267
00:25:09,230 --> 00:25:11,510
BY THE INCREASING STRENGTH\NOF THE SUNSHINE.
268
00:25:16,340 --> 00:25:19,780
HERE IN ALASKA,\NTHE COASTAL WATERS TURN GREEN
269
00:25:19,980 --> 00:25:22,520
WITH A SUDDEN BLOOM\NOF PHYTOPLANKTON.
270
00:25:25,950 --> 00:25:28,790
HERRING THAT HAVE SPENT\NTHE WINTER FAR OUT TO SEA
271
00:25:28,990 --> 00:25:31,530
TIME THEIR RETURN\NTO THE SHALLOW WATERS
272
00:25:31,730 --> 00:25:33,800
TO COINCIDE WITH THIS BLOOM.
273
00:25:34,000 --> 00:25:36,280
THEY COME IN VAST NUMBERS\NAND INITIATE
274
00:25:36,480 --> 00:25:39,790
ONE OF THE MOST PRODUCTIVE\NFOOD CHAINS IN ALL THE OCEANS.
275
00:25:54,980 --> 00:25:58,170
HUMPBACK WHALES ARE AT THE TOP\NOF THAT FOOD CHAIN.
276
00:25:58,370 --> 00:25:59,950
THEY HAVE SPENT THE WINTER
277
00:26:00,150 --> 00:26:02,480
BREEDING IN THE WARMER\NTROPICAL WATERS OFF HAWAII,
278
00:26:02,680 --> 00:26:04,920
BUT THERE WAS LITTLE FOOD\NFOR THEM THERE.
279
00:26:05,110 --> 00:26:08,440
THIS HERRING BONANZA\NPROVIDES THE VAST MAJORITY
280
00:26:08,640 --> 00:26:11,610
OF THEIR FOOD FOR THE YEAR.
281
00:26:32,020 --> 00:26:33,860
STELLAR AND CALIFORNIAN\NSEA LIONS
282
00:26:34,060 --> 00:26:36,340
ALSO RETURN FROM THE OPEN OCEAN
283
00:26:36,540 --> 00:26:38,460
EACH YEAR\NTO FEAST OFF THE HERRING.
284
00:26:49,340 --> 00:26:52,880
THE HERRING THEMSELVES, HOWEVER,\NHAVE NOT COME HERE FOR FOOD.
285
00:26:53,080 --> 00:26:54,750
THEY ARE ABOUT TO BREED.
286
00:26:54,950 --> 00:26:55,880
NOTHING DETERS THEM
287
00:26:56,080 --> 00:26:59,000
AS THEY HEAD\NFOR EVEN SHALLOWER WATERS.
288
00:27:01,050 --> 00:27:02,760
NOW THE WATERS ARE SO SHALLOW
289
00:27:02,960 --> 00:27:05,190
THAT GLAUCOUS-WINGED GULLS
290
00:27:05,390 --> 00:27:07,840
ARE ABLE TO SNATCH LIVE FISH\NFROM JUST BELOW THE SURFACE.
291
00:27:19,550 --> 00:27:22,600
IN SPITE OF THESE ATTACKS\NAND LOSSES,
292
00:27:22,800 --> 00:27:24,910
THE HERRING SWIM ON\NUNTIL THEY REACH THE VEGETATION
293
00:27:25,110 --> 00:27:27,680
THAT THE FEMALES NEED\NIF THEY ARE TO LAY.
294
00:27:34,080 --> 00:27:36,750
EACH FEMALE PRODUCES\NAROUND 20,000 EGGS,
295
00:27:36,950 --> 00:27:40,130
AND THEY'RE VERY STICKY.
296
00:27:42,610 --> 00:27:46,100
THE MALES ARRIVE SOON AFTER\NTHE FEMALES HAVE SPAWNED
297
00:27:46,300 --> 00:27:50,190
AND RELEASE THEIR SPERM\NIN VAST, MILKY CLOUDS.
298
00:27:54,360 --> 00:27:58,510
SOON, THE EXCESSES\NOF THE HERRINGS' SEXUAL SPREE
299
00:27:58,710 --> 00:28:01,760
CREATES A THICK WHITE SCUM\NON THE SURFACE.
300
00:28:03,890 --> 00:28:06,690
THROUGH THE SEASON,\NCURDS OF SPERM CLOG THE SHORES
301
00:28:06,890 --> 00:28:08,390
FOR HUNDREDS OF MILES
302
00:28:08,590 --> 00:28:10,780
FROM BRITISH COLUMBIA\NIN THE SOUTH
303
00:28:10,980 --> 00:28:12,900
ALL THE WAY\NTO ALASKA IN THE NORTH.
304
00:28:19,430 --> 00:28:23,180
AFTER A FEW DAYS, THIS GIGANTIC\NSPAWNING COMES TO AN END,
305
00:28:23,380 --> 00:28:25,530
AND THE HERRING\NHEAD BACK OUT TO DEEPER WATERS,
306
00:28:25,730 --> 00:28:28,010
LEAVING BEHIND THEM\NFERTILIZED EGGS
307
00:28:28,210 --> 00:28:31,970
PLASTERED ON EVERY ROCK\NAND STRAND OF VEGETATION.
308
00:28:43,150 --> 00:28:44,640
THEY TIME THEIR SPAWNING
309
00:28:44,840 --> 00:28:47,560
SO THAT TWO WEEKS LATER,\NWHEN THESE EGGS START TO HATCH,
310
00:28:47,760 --> 00:28:49,470
THE ANNUAL PLANKTON BLOOM
311
00:28:49,670 --> 00:28:50,950
WILL HAVE REACHED ITS HEIGHT,
312
00:28:51,150 --> 00:28:53,650
AND THE NEWBORN FISH FRY\NWILL HAVE PLENTY TO EAT.
313
00:28:53,850 --> 00:28:56,650
BUT IN THE MEANTIME,\NALL THESE EGGS PROVIDE FOOD
314
00:28:56,850 --> 00:28:58,870
FOR ARMIES OF DIFFERENT ANIMALS
315
00:28:59,070 --> 00:29:01,740
BOTH BELOW AND ABOVE\NTHE SURFACE.
316
00:29:08,050 --> 00:29:09,880
MILLIONS OF BIRDS ARRIVE
317
00:29:10,080 --> 00:29:12,800
TO COLLECT A SHARE\NOF THE HERRINGS' BOUNTY.
318
00:29:13,000 --> 00:29:15,320
SOME OF IT IS EASILY GATHERED,
319
00:29:15,520 --> 00:29:19,410
FOR MILLIONS OF EGGS HAVE BEEN\NWASHED UP ONTO THE SHORE.
320
00:29:19,610 --> 00:29:22,500
THIS ENCAPSULATED ENERGY
321
00:29:22,700 --> 00:29:25,550
IS PARTICULARLY VALUABLE\NTO MIGRATING BIRDS.
322
00:29:25,750 --> 00:29:28,030
THESE SURFBIRDS ARE ON THEIR WAY
323
00:29:28,230 --> 00:29:30,690
TO THEIR BREEDING GROUNDS\NIN THE ARCTIC,
324
00:29:30,890 --> 00:29:32,250
AND THEY HAD TO COME DOWN\NTO REFUEL.
325
00:29:32,450 --> 00:29:37,520
STRANDED HERRING EGGS\NARE JUST WHAT THEY NEED.
326
00:29:37,720 --> 00:29:40,040
BONAPARTE GULLS COLLECT THE EGGS
327
00:29:40,240 --> 00:29:42,040
JUST BELOW THE SURFACE\NOF THE WATER.
328
00:29:45,210 --> 00:29:46,530
FARTHER OUT IN THE BAY,
329
00:29:46,730 --> 00:29:48,620
HUGE FLOCKS OF DUCKS\NHAVE GATHERED.
330
00:29:48,820 --> 00:29:50,790
THEY'RE MOSTLY SURF SCOTERS --
331
00:29:50,990 --> 00:29:52,530
DIVING DUCKS THAT CAN FEED\NOFF THE BOTTOM
332
00:29:52,730 --> 00:29:54,960
SEVERAL METERS DOWN.
333
00:29:59,230 --> 00:30:01,590
THERE ARE SUCH HUGE QUANTITIES\NOF EGGS
334
00:30:01,790 --> 00:30:03,890
THAT EVEN SUCH A BIG ANIMAL\NAS A BEAR
335
00:30:04,090 --> 00:30:06,060
FINDS IT WORTHWHILE\NTO COLLECT THEM.
336
00:30:09,760 --> 00:30:12,600
THE SPAWNING OF THE HERRING\NIS A CRUCIAL EVENT
337
00:30:12,800 --> 00:30:15,950
IN THE LIVES OF MANY ANIMALS\NALL ALONG THE COAST.
338
00:30:16,150 --> 00:30:18,910
THE WHOLE EVENT COINCIDES\NWITH THE PLANKTON BLOOM,
339
00:30:19,110 --> 00:30:22,510
AND WITHIN THREE SHORT WEEKS,\NIT'S ALL OVER.
340
00:30:28,560 --> 00:30:33,000
THE MIGRATORY BIRDS LEAVE\NTO CONTINUE THEIR JOURNEY NORTH.
341
00:30:39,400 --> 00:30:40,840
THEY WILL NOT COME BACK
342
00:30:41,040 --> 00:30:44,100
UNTIL THE HERRING ALSO RETURN\NNEXT YEAR.
343
00:30:51,060 --> 00:30:53,190
Attenborough: GRAY WHALES.
344
00:30:57,070 --> 00:30:59,120
THEY HAVE FOLLOWED THE SUN\NNORTH,
345
00:30:59,320 --> 00:31:01,300
AND THEY TOO ARE SEEKING\NTHE FOOD
346
00:31:01,500 --> 00:31:04,420
THAT IS GENERATED BY THE BLOOM\NOF THE PHYTOPLANKTON.
347
00:31:06,470 --> 00:31:09,090
KRILL ARE FEEDING OFF IT,
348
00:31:09,290 --> 00:31:11,870
AND THESE WHALES ARE FEEDING\NON THE KRILL,
349
00:31:12,070 --> 00:31:14,530
SKIMMING IT FROM THE SURFACE\NWITH THE FILTER PLATES OF BALEEN
350
00:31:14,730 --> 00:31:18,320
THAT HANG FROM THEIR UPPER JAWS.
351
00:31:18,510 --> 00:31:23,840
GRAY WHALES MAKE\NONE OF THE LONGEST MIGRATIONS
352
00:31:24,040 --> 00:31:25,320
UNDERTAKEN BY ANY\NMARINE MAMMAL --
353
00:31:25,520 --> 00:31:27,760
A ROUND TRIP\NOF 12,000 MILES OR SO
354
00:31:27,960 --> 00:31:30,850
FROM THEIR BREEDING GROUNDS\NOFF MEXICO
355
00:31:31,050 --> 00:31:32,810
ALONG THE ENTIRE COAST\NOF NORTH AMERICA
356
00:31:33,010 --> 00:31:35,110
RIGHT UP TO THE ARCTIC OCEAN.
357
00:31:37,760 --> 00:31:39,820
THEY TRAVEL CLOSE TO THE COAST,
358
00:31:40,010 --> 00:31:43,470
WITH THE MALES AND NON-BREEDING\NFEMALES LEADING THE WAY.
359
00:31:43,670 --> 00:31:47,000
THE LAST TO START ARE THE COWS\NTHAT HAVE JUST GIVEN BIRTH.
360
00:31:47,200 --> 00:31:49,480
THEY HAVE TO WAIT\NUNTIL THEIR NEWBORN CALVES
361
00:31:49,680 --> 00:31:50,960
ARE SUFFICIENTLY BIG AND STRONG
362
00:31:51,160 --> 00:31:54,740
TO TACKLE\NSUCH AN IMMENSE JOURNEY.
363
00:31:54,940 --> 00:31:58,830
THEIR PROGRESS\NIS NECESSARILY SLOW.
364
00:31:59,030 --> 00:32:00,840
THE MOTHERS MUST STAY\NALONGSIDE THEIR YOUNG,
365
00:32:01,040 --> 00:32:04,610
AND EVEN A STRONG CALF CAN ONLY\NTRAVEL AT A COUPLE OF KNOTS.
366
00:32:06,750 --> 00:32:08,840
THEY STICK EVEN CLOSER\NTO THE SHORE,
367
00:32:09,040 --> 00:32:12,060
OFTEN WITHIN JUST 200 METERS.
368
00:32:14,710 --> 00:32:16,850
KILLER WHALES.
369
00:32:17,050 --> 00:32:18,980
THEY HAVE LEARNT\NTHAT GRAY WHALES
370
00:32:19,180 --> 00:32:20,550
FOLLOW TRADITIONAL ROUTES.
371
00:32:20,750 --> 00:32:22,860
THE KILLERS HAVE NO TROUBLE
372
00:32:23,060 --> 00:32:27,160
IN OVERTAKING A CALF\NAND ITS DEVOTED MOTHER.
373
00:32:30,030 --> 00:32:33,690
NORMALLY, THEY CONTINUALLY CALL\NTO ONE ANOTHER,
374
00:32:33,890 --> 00:32:35,870
BUT NOW THEY HAVE FALLEN SILENT.
375
00:32:36,070 --> 00:32:37,870
THE MOTHER GRAY WHALE\NAND HER CALF
376
00:32:38,070 --> 00:32:41,170
HAVE NO IDEA\NTHAT THEY'VE BEEN TARGETED.
377
00:33:01,280 --> 00:33:03,860
CATCHING UP WITH THE GRAY WHALES
378
00:33:04,050 --> 00:33:05,550
IS THE EASY PART\NFOR THE KILLERS.
379
00:33:05,750 --> 00:33:06,900
THEY HAVE TO BE CAUTIOUS,
380
00:33:07,100 --> 00:33:08,560
FOR THEY ARE ONLY\NABOUT HALF THE SIZE
381
00:33:08,760 --> 00:33:10,900
OF THE GRAY WHALE MOTHER.
382
00:33:14,380 --> 00:33:17,470
SHE CAN INFLICT REAL DAMAGE\NWITH HER TAIL.
383
00:33:25,780 --> 00:33:28,450
BUT THE KILLERS\NARE NOT AFTER HER.
384
00:33:28,640 --> 00:33:30,530
THEY'RE AFTER HER CALF.
385
00:33:30,730 --> 00:33:33,020
AS LONG AS THE MOTHER CAN KEEP\NIT ON THE MOVE, IT WILL BE SAFE,
386
00:33:33,210 --> 00:33:36,180
AND SHE DOES HER BEST\NTO HURRY IT ALONG.
387
00:33:39,490 --> 00:33:42,020
AT FIRST, THE KILLERS AVOID\NGETTING TOO CLOSE TO THE MOTHER
388
00:33:42,220 --> 00:33:43,630
BUT JUST KEEP PACE ALONGSIDE.
389
00:33:43,830 --> 00:33:46,720
THEY KNOW THAT THE CALF,\NGOING AT THIS SPEED,
390
00:33:46,920 --> 00:33:48,850
WILL EVENTUALLY TIRE.
391
00:33:58,510 --> 00:34:01,350
AFTER THREE HOURS\NOF BEING HARRIED IN THIS WAY,
392
00:34:01,550 --> 00:34:04,050
THE CALF BECOMES TOO EXHAUSTED\NTO SWIM ANY FURTHER.
393
00:34:04,250 --> 00:34:07,350
THE MOTHER HAS TO STOP.
394
00:34:07,550 --> 00:34:10,179
THIS IS THE MOMENT THE KILLERS\NHAVE BEEN WAITING FOR.
395
00:34:10,380 --> 00:34:11,880
THEY START TO TRY AND FORCE\NTHEMSELVES
396
00:34:12,080 --> 00:34:14,310
BETWEEN MOTHER AND CALF.
397
00:34:35,239 --> 00:34:37,120
A CALF SEPARATED FROM ITS MOTHER
398
00:34:37,320 --> 00:34:39,120
WILL NOT BE ABLE\NTO DEFEND ITSELF.
399
00:34:39,320 --> 00:34:42,170
TIME AND AGAIN,\NTHE BLACK FINS OF THE KILLERS
400
00:34:42,370 --> 00:34:44,900
APPEAR BETWEEN THE MOTTLED BACKS\NOF THE GRAY WHALES.
401
00:34:56,260 --> 00:34:58,100
AT LAST THE KILLERS SUCCEED,
402
00:34:58,300 --> 00:35:00,670
AND NOW THAT THEY'VE GOT\NTHE CALF ON ITS OWN,
403
00:35:00,870 --> 00:35:02,710
THEY CHANGE THEIR TACTICS.
404
00:35:02,910 --> 00:35:04,760
THEY LEAP RIGHT ONTO THE CALF
405
00:35:04,960 --> 00:35:07,230
AND TRY TO PUSH IT UNDER.
406
00:35:14,980 --> 00:35:17,680
NOW, THE WHOLE POD IS INVOLVED.
407
00:35:27,990 --> 00:35:30,250
ONE OF THEM TAKES A BITE.
408
00:35:43,010 --> 00:35:45,840
SOON, THE SEA IS REDDENED\NWITH THE CALF'S BLOOD,
409
00:35:46,040 --> 00:35:49,190
AND THE KILLERS CLOSE IN\NFOR THE FINAL ACT.
410
00:36:10,210 --> 00:36:13,300
THE CALF IS DEAD.
411
00:36:17,040 --> 00:36:18,880
AFTER A SIX-HOUR HUNT,
412
00:36:19,080 --> 00:36:22,390
THE KILLER WHALES\NHAVE FINALLY WON THEIR PRIZE.
413
00:36:28,050 --> 00:36:29,930
THE MOTHER, BEREFT,
414
00:36:30,130 --> 00:36:32,880
HAS TO CONTINUE HER MIGRATION\NNORTH ON HER OWN.
415
00:36:37,060 --> 00:36:39,900
SHE LEAVES BEHIND\NTHE CARCASS OF A CALF
416
00:36:40,100 --> 00:36:43,900
THAT SHE CHERISHED FOR 13 MONTHS\NIN HER WOMB,
417
00:36:44,100 --> 00:36:47,330
FOR WHICH SHE DELAYED\NHER OWN JOURNEY TO FIND FOOD.
418
00:36:51,030 --> 00:36:53,390
Attenborough: OVER A MILE DOWN,
419
00:36:53,590 --> 00:36:55,260
IN THE TOTAL\NDARKNESS OF THE DEEP OCEAN,
420
00:36:55,460 --> 00:36:59,480
THE BODY OF ANOTHER GRAY WHALE,\NA 30-TON ADULT.
421
00:36:59,680 --> 00:37:04,570
IT SETTLED HERE\NONLY A FEW WEEKS AGO.
422
00:37:04,770 --> 00:37:09,400
ALREADY, IT HAS ATTRACTED\NHUNDREDS OF HAGFISH.
423
00:37:14,440 --> 00:37:17,630
THESE SCAVENGERS,\NOVER HALF A METER LONG
424
00:37:17,830 --> 00:37:21,590
AND AS THICK AS YOUR ARM,\NARE ONLY FOUND IN THE DEEP SEA.
425
00:37:21,790 --> 00:37:24,590
THEY HAVE BEEN ATTRACTED\NBY THE FAINT WHIFF OF DECAY
426
00:37:24,790 --> 00:37:28,850
SUFFUSING THROUGH THE WATER\NFOR MILES AROUND.
427
00:37:31,460 --> 00:37:34,300
WITH THEIR HEADS BURIED\NIN THE WHALE'S FLESH,
428
00:37:34,500 --> 00:37:36,430
THEY BREATHE THROUGH\NGILL OPENINGS
429
00:37:36,630 --> 00:37:38,220
ALONG THE SIDES OF THEIR BODIES.
430
00:37:38,420 --> 00:37:40,310
THEY'RE VERY\NPRIMITIVE CREATURES --
431
00:37:40,510 --> 00:37:44,310
NOT EVEN TRUE FISH,\NFOR THEY LACK JAWS.
432
00:37:44,510 --> 00:37:47,230
THEY FEED, NOT BY BITING,
433
00:37:47,430 --> 00:37:50,180
BUT BY RASPING OFF FLESH\NWITH TWO ROWS OF HORNY TEETH.
434
00:37:52,400 --> 00:37:54,190
IN JUST A FEW HOURS,\NA HAGFISH CAN EAT
435
00:37:54,390 --> 00:37:55,930
SEVERAL TIMES ITS OWN WEIGHT
436
00:37:56,130 --> 00:37:58,620
OF ROTTING FLESH.
437
00:38:01,320 --> 00:38:05,150
NEXT TO ARRIVE,\NA SLEEPER SHARK.
438
00:38:11,500 --> 00:38:14,340
IT MOVES SO SLOWLY\NTO CONSERVE ENERGY --
439
00:38:14,540 --> 00:38:17,040
AN IMPORTANT STRATEGY\NFOR SO LARGE AN ANIMAL
440
00:38:17,240 --> 00:38:20,340
SURVIVING IN SUCH\NA POOR HABITAT.
441
00:38:26,520 --> 00:38:29,350
SLEEPER SHARKS LIVE\NOVER A MILE DOWN
442
00:38:29,550 --> 00:38:33,490
AND GROW\NTO OVER SEVEN METERS LONG.
443
00:38:33,690 --> 00:38:36,490
THEY CAN GO FOR MONTHS\NWITHOUT FOOD,
444
00:38:36,690 --> 00:38:39,540
SLOWLY CRUISING\NALONG THE BOTTOM,
445
00:38:39,740 --> 00:38:42,020
WAITING FOR RARE BONANZAS\NSUCH AS THIS ONE
446
00:38:42,220 --> 00:38:44,580
TO ARRIVE FROM ABOVE.
447
00:38:51,240 --> 00:38:54,380
A WHOLE RANGE OF DIFFERENT\NDEEP-SEA SCAVENGERS
448
00:38:54,580 --> 00:38:57,380
WILL FEAST ON THIS CARCASS\NFOR A LONG TIME
449
00:38:57,580 --> 00:39:00,380
BEFORE ALL ITS NUTRIMENT\NHAS BEEN CONSUMED.
450
00:39:02,550 --> 00:39:04,040
18 MONTHS LATER,
451
00:39:04,240 --> 00:39:07,600
ALL THAT IS LEFT IS A PERFECT\NSKELETON STRIPPED BARE.
452
00:39:10,560 --> 00:39:12,750
THE SUN'S ENERGY,\NTHAT WAS CAPTURED
453
00:39:12,950 --> 00:39:16,180
AND TURNED INTO LIVING TISSUE\NBY THE FLOATING PHYTOPLANKTON,
454
00:39:16,380 --> 00:39:18,400
HAS BEEN TRANSFERRED\NFROM ONE LINK TO ANOTHER
455
00:39:18,600 --> 00:39:20,320
IN THE FOOD CHAIN\NAND HAS ENDED UP
456
00:39:20,520 --> 00:39:21,930
AS FAR AWAY FROM THE SUN
457
00:39:22,130 --> 00:39:24,280
AS IT IS POSSIBLE TO BE\NON THIS PLANET --
458
00:39:24,480 --> 00:39:27,410
AT THE BOTTOM OF THE DEEP SEA.
459
00:39:27,610 --> 00:39:31,450
BUT SOME ENERGY\NALSO RETURNS FROM THE DEEP.
460
00:39:36,760 --> 00:39:38,600
MILLIONS OF OPALESCENT SQUID
461
00:39:38,800 --> 00:39:41,430
ARE ON THEIR WAY\NTO THE SHALLOWS.
462
00:39:41,630 --> 00:39:43,950
THEY'VE COME UP HERE TO MATE.
463
00:39:44,150 --> 00:39:48,210
AS THE MALES GRAB THE FEMALES,\NTHEIR TENTACLES FLUSH RED.
464
00:39:50,600 --> 00:39:52,440
FOR MOST OF THE YEAR,
465
00:39:52,640 --> 00:39:54,960
THESE SQUID LIVE\NAT A DEPTH OF AROUND 500 METERS.
466
00:39:55,160 --> 00:39:57,140
THEY ONLY COME TOGETHER
467
00:39:57,340 --> 00:39:59,620
IN THESE GREAT BREEDING SCHOOLS\NFOR A FEW WEEKS.
468
00:39:59,820 --> 00:40:02,360
JUST ONE SCHOOL WAS ESTIMATED\NTO CONTAIN ANIMALS
469
00:40:02,560 --> 00:40:05,750
THAT WEIGH AROUND 4,000 TONS.
470
00:40:16,280 --> 00:40:19,120
WAVE AFTER WAVE\NRISE FROM THE DEPTHS,
471
00:40:19,320 --> 00:40:20,810
AND SOON THE SEABED\NIN THE SHALLOWS
472
00:40:21,010 --> 00:40:23,380
IS STREWN WITH DENSE PATCHES\NOF EGG CAPSULES
473
00:40:23,580 --> 00:40:25,680
SEVERAL METERS ACROSS.
474
00:40:30,810 --> 00:40:34,480
AS EACH FEMALE ADDS ANOTHER\NCAPSULE TO THE PILE,
475
00:40:34,680 --> 00:40:37,600
THE MALES FIGHT\NTO FERTILIZE ITS CONTENTS.
476
00:40:53,970 --> 00:40:56,810
THE SQUID MAKE THEIR HUGE\NJOURNEY INTO THE SHALLOWS
477
00:40:57,010 --> 00:41:00,240
BECAUSE THEIR EGGS WILL DEVELOP\NFASTER IN THE WARMER WATER HERE,
478
00:41:00,440 --> 00:41:01,680
AND WHEN THE YOUNG EMERGE,
479
00:41:01,880 --> 00:41:04,070
THEY WILL FIND MORE FOOD\NMORE EASILY
480
00:41:04,270 --> 00:41:07,590
THAN THEY WOULD\NIN THE OCEAN DEPTHS.
481
00:41:11,120 --> 00:41:13,820
DAWN THE NEXT MORNING,
482
00:41:14,020 --> 00:41:17,520
AND THE SEABED FOR MILES AROUND\NIS COVERED IN EGG CAPSULES.
483
00:41:17,720 --> 00:41:20,130
THE SQUID THEMSELVES\NHAVE ALL GONE.
484
00:41:20,330 --> 00:41:21,790
MANY WILL HAVE DIED,
485
00:41:21,990 --> 00:41:24,660
BUT SOME WILL HAVE RETURNED\NTO THEIR HOME IN THE DEEP.
486
00:41:24,860 --> 00:41:27,840
THEY WILL NOT RETURN\NTO THE LIGHT OF THE SUN
487
00:41:28,040 --> 00:41:32,530
UNTIL THE NEXT TIME THEY ARE\NDRIVEN UP BY THE URGE TO SPAWN.
36275
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