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Our world is not always the same.
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Hidden from our view lies a
different world.
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Creatures utterly unlike us.
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(THUNDER CRASHES)
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Almost alien.
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Yet they are more numerous
than any other group on the planet.
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Welcome to the fascinating
world of the arthropods.
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Spiders, scorpions and insects.
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Today we have new camera techniques
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that will allow us to reveal in
greater detail
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than ever before their lives.
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The way they fight and feed and
reproduce.
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This series uses specially developed
3D camera technology
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to study the micro world in
extraordinary detail,
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both on location and in specially
constructed environments.
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We'll witness their births, the
challenges they face,
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and the moments when their lives
hang in the balance.
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And that may help us understand
how it is that today
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over 80% of all animal species on
this planet are arthropods.
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In this series we will see the way
they have evolved.
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From the comparative simplicity of
the millipede,
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to vast colonies that contain
hundreds, even millions,
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of individuals.
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We'll witness the most extraordinary
transformations
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in the animal kingdom.
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We'll meet ants that farm,
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spiders that can cast their webs...
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..and the bug that wears the bodies
of its victims as a disguise.
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Welcome to a strange
and dangerous world.
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Our planet's rainforests are home to
millions of animal species.
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Nearly 90% of them are arthropods,
some call them bugs,
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and they're all searching for food.
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In fact, there's food for most of
them everywhere,
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because over half
of all bugs eat plants.
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Millipedes were among the first
arthropods to move up
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out of the water onto the land.
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They can have up to 750 legs,
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grow to lengths of 30 centimetres
and live for as long as seven years.
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And this body plan is so efficient
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that it's remained largely unchanged
for hundreds of millions of years.
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Their body is divided into segments,
each with its own set of legs
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and internal organs.
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A heart runs
the entire length of it,
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supplying each segment with oxygen.
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It eats decaying leaves and plants,
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just as its ancestors did
over 400 million years ago.
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Millipedes are peaceful creatures,
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but they don't have
the forest to themselves.
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There are other multi-segmented
creatures here
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that have a very different
way of life.
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Centipedes.
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They are meat eaters.
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Centipedes are closely
related to millipedes,
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and they prey on other bugs.
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There are over 8,000
species of them,
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and they all have poisonous stings.
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This one lives in caves in India.
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Their powerful, independently
moving legs
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make them much faster than
millipedes.
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This is the one to be feared most -
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meet Scolapendra.
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But it's not the only top
predator here.
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This Red Claw Scorpion from Tanzania
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is not as fast or as agile,
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but its powerful pincers and sting
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make it every bit as deadly.
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Scorpions and centipedes are
competitors.
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They hunt the same prey...
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..and in the same territory.
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And because of that,
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if they meet, they fight.
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Scolapendra uses all its strength
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to try and get under
Red Claw's armour.
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But the scorpion's defences
are too strong.
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It's not Red Claw's attack
that wins the day,
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it's Scolapendra's weak
defence that loses it.
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If you can't defend yourself,
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you're not likely to stay alive
for long in the micro-world.
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Australia.
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Home to a beetle with one of the
oddest defences.
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This is a pie dish beetle.
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The outback certainly gets very dry,
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so you might think
that this strange shell
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is just for collecting water,
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but its primary function is defence.
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A Mantis.
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Normally a hunter,
but with this potential prey,
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it doesn't know how to even begin.
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But the pie dish beetle's armour
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does have its disadvantages -
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it's not what you
might call manoeuvrable.
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Other Australian insects have a
different defensive strategy.
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This stick insect relies on
camouflage to make it invisible,
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but that too comes at a cost.
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Being shaped like a stick
makes it difficult to fly.
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So if a predator does find it,
it could be done for.
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A huntsman spider -
and it's ready to strike.
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It's one of the fastest
and most agile of all spiders.
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But the stick insect
doesn't even try to escape.
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She has a weapon of last resort.
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A milky substance
from the glands behind her head.
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The spray can reach half a metre,
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and she'll have enough to have
a few goes before running dry.
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It fills the forest with
the scent of peppermint.
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To the huntsman,
it's an unbearable irritant.
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So the stick insect is free
to graze in peace.
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Ever since they first appeared
on land,
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the arthropods have been fighting
one and other -
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over food, over territory,
over a mate.
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The ways they have developed
in order to do so
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are truly astonishing.
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On the floor of forests almost
anywhere in the world,
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you'll find these -
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bombardier beetles.
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They look fairly harmless,
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but not many creatures are foolhardy
enough to try and eat them.
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A mantis.
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Some mantises are so large
and strong,
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they can even kill small birds.
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A beetle should be easy.
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But not this one.
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A fraction of a second after
the mantis strikes,
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the beetle squirts hot gas
and caustic chemicals in its face.
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The chemicals are produced
by a reaction in its abdomen,
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which generates enough heat to bring
the liquid close to boiling point.
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The bombardier's spray can be
deadly to smaller creatures...
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..but the mantis is large
and it survives.
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As does the beetle.
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On the African savannah,
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there's a hunter that sets its traps
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wherever there is dust or dry sand.
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This is the lava of an ant-lion.
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As an adult, it will look
something like a dragonfly,
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and then its sole purpose
will be to mate.
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It'll barely even eat.
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But now as a larva,
its task is to feed and grow.
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To do that, it digs a pit trap
in the sand,
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and buries itself at the bottom,
jaws uppermost.
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It can jerk its head so violently
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that it can shoot up sand grains
like bullets.
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And now it waits.
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An ant wanders into the pit...
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..and loses its foothold.
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The ant can't climb out.
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The sand slips from under its feet.
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Eventually, it tires.
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And the ant-lion drags
it beneath the sand...
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and devours it.
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For the ant-lion, remaining hidden
is a good way to hunt.
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And there are a multitude
of places to do that
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in a forest.
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Here there are predators
that set perhaps the most
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perfect of all ambushes.
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This female trapdoor spider lives
in a burrow with a camouflaged lid.
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And she'll stay here
for her entire 20-year life.
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Around the burrow,
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she's laid out a network
of invisibly fine strands of silk.
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She'll pounce on anything
that trips on them.
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Occasionally, she tests to see
that her door opens smoothly.
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But mostly, she waits.
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A cricket.
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Got it.
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She pulls her prey into the burrow -
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so that she can eat it in safety
and at her leisure.
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00:16:20,600 --> 00:16:24,040
But some bugs have
such perfect camouflage
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they're virtually invisible,
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even though they're totally exposed.
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Predators use camouflage
to hunt their prey unseen.
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Their victims use it to avoid
being found and eaten.
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But disguise can be a potent weapon.
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In the forests of East Africa,
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one insect has taken its camouflage
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to a bizarre and somewhat
gruesome extreme.
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This is an assassin bug.
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To us, it's easy enough to spot
because it moves.
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To its prey, that's irrelevant
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because it smells
like one of their number.
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The assassin sucks its victims dry
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and glues their empty
husks onto its back.
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This one is already carrying
at least 20 corpses.
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Its irregular shape makes it hard
for other predators to spot it...
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..and makes it virtually invisible
to its prey - ants.
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It enters this ant colony
unchallenged.
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Its coat of ant corpses
masks its own odour.
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To the ants, it smells
like one of their own,
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and that's what matters.
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They'll even run straight
over the top of it.
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The assassin simply takes an ant
whenever it feels hungry.
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And the body of each victim
then adds to its disguise.
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Conflict pervades the bug world.
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It shapes their bodies.
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It dictates their lifestyles.
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The ant-lions beneath the sand.
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The trapdoor spiders -
20 years in a burrow.
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And it's their extraordinary
diversity
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that underpins their success.
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In the next programme,
I'll look at arthropod predators.
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These are the creatures that must
kill in order to eat.
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They have evolved the most
extraordinary ways to do so.
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00:20:37,780 --> 00:20:39,643
And they take many forms.
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We'll meet a spider that has
turned its web into a casting net.
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We'll witness the ingenious hunting
tactics of another spider
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that preys on its fellows.
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00:21:04,400 --> 00:21:07,480
We'll meet creatures that use
the surface of water
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like a radar dish
to detect their prey.
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00:21:12,400 --> 00:21:16,120
And an extraordinary wasp
that tames a cockroach
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so her young can eat it alive.
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We'll encounter the most deadly
creatures of the micro-world.16564
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