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NARRATOR: Sir David Attenborough
is the unstoppable champion
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NARRATOR: Sir David Attenborough
of the natural world.
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of the natural world.
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His pioneering ideas
about life on our planet
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His pioneering ideas
opened our eyes to new worlds.
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opened our eyes to new worlds.
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These have been called
nature's greatest experiment.
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In his mid-80s,
many thought he had retired.
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However, over the next seven years,
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he launched a new era
However, over the next seven years,
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he launched a new era
of natural-history filmmaking.
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(SQUAWKS)
Ooh!
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(LAUGHS)
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He revisited iconic locations
across the globe.
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I'm here surrounded
by one of nature's greatest wonders.
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Embracing advanced technologies,
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his mission was to show us the world
from a different perspective.
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Ow!
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That's a very powerful beak!
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This is a journey from that very
special time of global adventures.
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Oceans cover
almost three-quarters of our planet.
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It's a world which reveals
an astonishing diversity of life.
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In the shallow seas off the
north-east coast of Australia
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lies the world's
largest coral-reef system.
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I'm here surrounded
by one of nature's greatest wonders,
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a living structure so enormous
it can be seen from space...
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..the Great Barrier Reef.
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I've been fascinated by it
for almost 60 years.
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It's an ecosystem like no other.
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And, for me,
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it's truly one of the most
extraordinary places on the planet.
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Coral reefs
are surprisingly noisy places.
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Fish and invertebrates
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produce a whole range
of clicks and grunts and snaps.
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produce a whole range
The healthier the reef
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The healthier the reef
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the more varied and numerous
The healthier the reef
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the more varied and numerous
its inhabitants
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the more varied and numerous
and the louder this chorus is.
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and the louder this chorus is.
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We now know that fish,
just like birds,
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vocalise most at dawn and dusk.
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(SNAPPING)
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Damselfish
call to defend their territory.
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(SNAPPING)
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Seahorses click to attract a mate.
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(CLICKING)
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(GRUNTING)
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Others create
a very different soundscape
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simply by carrying out
their daily duties.
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(CRUNCHING)
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Parrotfish
crunching through the hard coral
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Parrotfish
are a constant on the reef.
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are a constant on the reef.
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(CRUNCHING)
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Fish perceive sound
(CRUNCHING)
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Fish perceive sound
in two different ways.
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Fish perceive sound
Many have internal ears,
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Many have internal ears,
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but underwater they can also
feel sound as a vibration.
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The noise is a key indication
that the community is in good shape.
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In fact,
the louder the noise on a reef
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the more inviting it is to newcomers,
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newcomers like the young clownfish.
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This little male
is no bigger than a button,
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but the time has come for him
to find his place in the big city.
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At this stage, his swimming abilities
leave something to be desired.
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But his hearing is so sensitive,
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he can tell over hundreds of metres
if a reef is suitable.
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His journey can last days.
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The final approach is usually made
at night to avoid predators.
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In the case of the clownfish,
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juveniles have been known to travel
250 miles before they find a reef.
In the case of the clownfish,
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juveniles have been known to travel
250 miles before they find a reef.
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Fortunately, for the majority,
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it's usually a much shorter journey.
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While they rarely return
to the particular anemone
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While they rarely return
beside which they hatched,
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beside which they hatched,
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60% find a new home on the same reef.
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The clownfish
keeps the anemone in good health
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by removing unwanted parasites,
keeps the anemone in good health
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by removing unwanted parasites,
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and, in return,
the anemone offers security.
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Its stinging cells
ward off the sort of creatures
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which would otherwise
threaten the clownfish.
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Cooperation is the key to success in
this extremely crowded environment.
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Other residents, however,
take a very different approach.
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Rather than share their home,
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Rather than share their home,
their territories.
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they fiercely defend
their territories.
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This is a mantis shrimp.
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There are many different species
of mantis shrimp,
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but they all have
one thing in common...
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..superb vision.
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The 400-million-year-old
visual system of the mantis shrimp
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is the most complex
in the entire animal kingdom.
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is the most complex
in the entire animal kingdom.
Its eyes
are mounted on two stalks,
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Its eyes
are mounted on two stalks,
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giving it
independent vision.
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But, whereas our eyes
produce binocular vision,
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each one of theirs
produces three different images.
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each one of theirs
Not only that -
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Not only that -
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whereas we have three
photo receptors in our eyes,
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the mantis shrimp has up to 16,
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giving it access
to parts of the spectrum
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that we can't even see,
let alone imagine.
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And they can use their amazing vision
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to devastating effect.
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While some are armed with spears,
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others carry clubs.
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Many are champion boxers.
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They can deliver a punch
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that accelerates faster
than a .22 calibre bullet.
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These powerful blows
are used to stun their prey
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and defend their burrows.
are used to stun their prey
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and defend their burrows.
9493
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