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Help kids learn and
grow with PBS Kids.

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Thank you for supporting
your PBS station.

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All around the planet,

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billions of animals
are on the move...

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...making incredible journeys.

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The most amazing of these
are the smallest.

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This series uses
the latest camera technology

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to follow six tiny animals

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on the biggest adventures
of their lives

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as they travel through
extraordinary landscapes...

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...where every little step
counts.

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The greatest adventures
are the smallest.

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Kirindy Forest, Madagascar.

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This tiny chameleon
is a few minutes old...

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...half the size
of a matchstick.

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She has spent seven months
underground,

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developing inside her egg.

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And now her own eggs
are already growing inside her.

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She's starting a journey
to find a male.

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These chameleons only live
for a matter of months.

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Her instincts
drive her to climb.

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Built for the ascent,
her feet can swivel...

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...helping her cling to cracks.

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She heaves her way upwards.

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The climb is 150 times
her body length,

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like a human scaling
the Empire State Building.

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16 feet up, she's in
a very different world...

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...a dense network of branches

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that give shade
and create aerial highways.

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She's hungry.

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She has never eaten before,

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but she knows food
when she sees it--

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flies.

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They have split-second reflexes,

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but she's born with
the skills of an assassin.

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Her eyes search
almost 360 degrees.

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A target.

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Both eyes lock on
with binocular vision.

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And she fires
her lightning-fast tongue.

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It's twice the length
of her body

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and as sticky as honey.

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She catches up to
100 flies a day.

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In just two weeks,
she's doubled in size.

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The fading light
and decreasing accuracy

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is her cue to get some sleep.

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Being light on her feet,

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she can reach places
where most predators can't.

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The thinnest branches
are the safest.

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Her pincer-like feet clamp
onto the branch.

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It's like sleeping
on a tightrope.

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A cat-eyed tree snake...

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...it's still light enough
to reach her.

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Deep in slumber, the chameleon
is at her most vulnerable.

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The snake's approach causes tiny
vibrations along the branch

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that the chameleon can sense,
even when asleep.

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And when the snake is too close,

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they wake her up.

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All she can do

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is let go.

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Her radical move is
a deliberate escape strategy.

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But it has put her right back
on the dangerous forest floor

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in the middle of the night.

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6,000 miles away,

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the Cairngorms of Scotland...

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...home to one of Britain's
shyest animals...

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...a water vole.

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This female is three months old

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and small enough to fit
in the palm of a human hand.

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She is busy preparing her small
territory by digging burrows,

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ready to raise a family.

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She must eat two-thirds
of her body weight every day

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to stay in prime condition.

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There's just a few weeks left
to mate and raise pups

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before the first signs
of winter.

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To attract a suitor,

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she strategically leaves
droppings around her territory.

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Today, she's got
some attention...

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...a vole's worst nightmare...

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...an invasive American mink.

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Its ultrasonic hearing
can detect the slightest squeak.

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To a water vole,
its odor is a trigger...

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to run.

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Just one mink could wipe out
every vole in this glen

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in just a few weeks.

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She's lost her riverbank home.

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She must now travel
into the unknown

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to find a new territory
in which to have her first pups.

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Two miles into the glen...

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...she's alone, homeless,
and exhausted.

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She needs a place to rest.

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A burrow.

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She could make it her new home.

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It's occupied.

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A pregnant water vole.

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This is her burrow,

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and she will fight to the death
to defend it.

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Being less experienced,
the best option is to flee.

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But the path ahead...

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is blocked.

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Back in Madagascar,

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with her biological clock
rapidly ticking away,

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the chameleon is searching for
a way back up into the trees.

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She's unaware of the predators
that lurk in the dark.

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Her brown, mottled skin
helps her

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to blend into the leaf litter.

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Could this tiny twig
lead her up?

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No.

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It's a stick insect.

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As she travels,
her cover disappears.

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She's on a dirt track

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cut through the forest
by humans.

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Drawn towards a tree trunk,

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she hauls herself upwards

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with every ounce of energy
she has left.

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Finally,
she can get back to sleep.

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Dawn reveals a harsh reality.

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Once, there were trees
all the way to the horizon.

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Now there is nothing.

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It's a long way back.

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Finally, in the safety
of a tree...

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...but she's facing
another problem.

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Being shaken off
is the last thing she needs.

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Red-fronted lemurs.

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Feeding on the fruit
in this neem tree,

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they've created a sticky mess...

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...a magnet for flies.

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A chance to get her energy back

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before she continues her journey
to find a mate.

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Far away in Scotland,
the vole's search for a new home

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has taken her three miles
into the glen.

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Ahead of her lies water.

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She's spent her entire life
around streams.

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But with poor eyesight,

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she has misjudged
how far it is to the other side.

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This loch is vast.

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In the cold waters beneath her,

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monsters lurk.

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Giant pike, four times her size,

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could swallow her whole...

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...if she doesn't drown first.

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She's never swum more than
a few feet from land before.

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The farther she swims
from shore,

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the more likely
she will be detected.

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Once a pike senses ripples...

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...most prey
don't stand a chance.

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But this water vole
has made it to the other side.

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For now, she's safe.

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Running water...

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...it's the sound of home.

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If she follows it,

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she might find the habitat
that she's looking for.

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The higher she climbs,

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the rockier it becomes.

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600 feet up, there's trouble.

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A golden eagle...

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30 times bigger
than a water vole.

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With vision five times
more powerful than a human's,

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it could spot a vole
from more than a mile away.

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She will have to
sleep here tonight.

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In Madagascar,
four months have passed,

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and the chameleon has reached
a pivotal moment

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in her short life.

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She has undergone the most
extraordinary transformation.

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She has become an adult.

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Now as long as a human finger,

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her skin is
a kaleidoscope of color...

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...created by special
light-reflecting nanocrystals

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in her skin cells.

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A chameleon's color is primarily
used for communication,

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and it changes
with her mood.

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Her most important signal
is a crimson spot...

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...indicating that
she is ready to mate.

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Her eggs are fully grown
and visible through her skin.

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Now she needs to find a male
to fertilize them.

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She needs to secure an area
to show off her colors...

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...but every female
of her species

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is on the same
biological clock...

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...all vying for the attention
of a male.

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Already, she has competition.

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Females can't risk damage
to their delicate eggs.

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They rarely make contact.

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Instead, they rely on
elaborate warning displays.

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She attacks from below.

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Having forced her rival away...

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...she has claimed this area
as her own.

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She can now dazzle her colors.

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She's attracted a male.

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There are two.

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They must prove their worth.

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They are twice her size

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and built for combat.

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The bigger the nose horn,
the more attractive the male...

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...and the taller
the head crest,

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the more powerful
the bite.

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These two gladiators
are evenly matched.

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She monitors every movement
from a safe distance.

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The most dominant male will
pass on the strongest genes.

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They must fight it out
to win her favor.

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Unlike females,
they don't hold back.

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This could be the last battle
of their lives,

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before they die.

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It will only end
when one backs down...

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...and falls.

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She allows the victor
to approach.

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After mating,

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they will never
see each other again.

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With her eggs fertilized,

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there is only one more stage
of her journey to complete...

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...to find a safe place
to lay them,

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before her life
comes to an end.

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The water vole is now five miles
from her old riverbank home.

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Her search has
taken her to altitude.

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She's in alien territory...

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...but keeps climbing.

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She's over 2,000 feet up.

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Before her lies a new frontier.

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With the threat of the eagle,

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she must move on quickly.

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She's lost a lot of weight

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00:36:06,360 --> 00:36:08,680
and is depleted of minerals.

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00:36:15,800 --> 00:36:17,720
She'll need more
than just grass,

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00:36:17,840 --> 00:36:19,680
to get her strength back.

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Red deer.

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They may provide
just what she needs.

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An old stag's antler,

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packed with minerals.

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A hundred times
more calcium than milk.

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She's not the first vole
to have taken a bite here.

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A few nibbles is all she needs.

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And then an adder,

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the U.K.'s only venomous snake.

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Being cold-blooded, it's basking
in the sun to warm up.

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A bite from an adult
could kill.

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But, luckily for the water vole,
this one isn't yet fully grown.

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Neither vole nor snake
is a threat to the other.

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Finally reaching
the valley floor,

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she has entered prime
water-vole habitat...

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...and there's a burrow.

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She is wary.

240
00:39:13,120 --> 00:39:14,880
There is something here...

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It's just a harmless toad
taking shelter.

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With no sign of
a resident water vole,

243
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she's found a new home.

244
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If she can find a mate,

245
00:39:45,560 --> 00:39:48,680
she will still have time
to raise a family.

246
00:39:51,760 --> 00:39:54,240
With darkness falling,

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she can rest.

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Back in her forests,
the chameleon is 5 months old

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and has reached old age.

250
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Nearing the end of her journey,

251
00:40:30,640 --> 00:40:34,280
she must find the perfect spot
to lay her eggs.

252
00:40:42,120 --> 00:40:46,080
She has no time to waste
on an approaching male.

253
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He's too late.

254
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Puffing up her body
and expanding her skin cells,

255
00:41:13,320 --> 00:41:17,000
she turns from green to black...

256
00:41:30,200 --> 00:41:33,640
...a clear signal to back off.

257
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Instinct drives her
towards the forest floor.

258
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Now a beacon of color,

259
00:42:12,800 --> 00:42:15,560
she stands out amongst
the leaf litter...

260
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...and is slower...

261
00:42:27,200 --> 00:42:30,640
...weighed down by eight eggs,

262
00:42:30,760 --> 00:42:33,080
a third of her body weight.

263
00:42:36,400 --> 00:42:39,360
She needs to head away
from tree roots,

264
00:42:39,480 --> 00:42:41,680
to a place
where she can dig...

265
00:42:47,880 --> 00:42:51,160
...and with just
the right amount of sunlight

266
00:42:51,280 --> 00:42:53,120
to incubate her eggs.

267
00:43:01,200 --> 00:43:05,680
With every step,
she could be spotted.

268
00:43:14,720 --> 00:43:18,000
A giant hognose snake,

269
00:43:18,120 --> 00:43:20,120
over six feet long.

270
00:43:26,440 --> 00:43:30,320
Her only defense
is to rock gently...

271
00:43:35,240 --> 00:43:38,040
...to try to look like
a leaf in the breeze.

272
00:44:07,720 --> 00:44:10,840
This snake is an egg eater.

273
00:44:20,440 --> 00:44:24,200
The chameleon needs to wait
for the coast to be clear

274
00:44:24,320 --> 00:44:26,560
before she can start laying.

275
00:44:33,560 --> 00:44:36,320
She's found the perfect spot.

276
00:44:49,200 --> 00:44:54,200
Her whole short life has been
about getting to this moment...

277
00:45:04,960 --> 00:45:07,880
...and her time
has almost run out.

278
00:45:18,760 --> 00:45:21,600
With her last ounce of energy,

279
00:45:21,720 --> 00:45:23,560
she covers her eggs.

280
00:45:31,760 --> 00:45:35,880
Her life's journey
is now complete.

281
00:46:04,040 --> 00:46:08,480
In her last moments,
her skin erupts with color...

282
00:46:15,160 --> 00:46:18,280
...as if uttering
her last words.

283
00:46:48,360 --> 00:46:49,840
She is not the only one

284
00:46:49,960 --> 00:46:52,720
to have made
such an incredible journey.

285
00:46:57,960 --> 00:47:02,680
Every chameleon of her species
is now dead.

286
00:47:29,000 --> 00:47:32,920
All that remains
are thousands of eggs,

287
00:47:33,040 --> 00:47:36,520
buried beneath the soil
of Kirindy Forest...

288
00:47:40,000 --> 00:47:45,600
...time capsules evolved to
survive the deadly dry season...

289
00:47:47,880 --> 00:47:51,160
...until they hatch, en-masse,

290
00:47:51,280 --> 00:47:55,320
when the wetter weather returns
in seven months' time.

291
00:48:08,080 --> 00:48:10,760
Having found perfect habitat,

292
00:48:10,880 --> 00:48:13,480
the water vole is scent-marking
the boundaries

293
00:48:13,600 --> 00:48:15,640
of her new territory...

294
00:48:25,680 --> 00:48:28,960
...but she needs to mate
within the next few days,

295
00:48:29,080 --> 00:48:32,120
to ensure any pups
survive the winter.

296
00:48:37,520 --> 00:48:39,920
300 feet from the burrow,

297
00:48:40,040 --> 00:48:42,800
she sniffs a distinctive odor.

298
00:48:46,920 --> 00:48:48,560
A latrine.

299
00:48:56,200 --> 00:48:58,440
There's a well-trodden path...

300
00:49:07,360 --> 00:49:10,320
...and the chopped-up
leftovers of a meal.

301
00:49:51,600 --> 00:49:54,840
At last, a male.

302
00:50:05,080 --> 00:50:08,520
The voles here
have lighter-colored fur...

303
00:50:10,720 --> 00:50:13,480
...a sign that they have
different ancestors.

304
00:50:25,080 --> 00:50:29,680
But attractiveness has little
to do with fur color.

305
00:50:32,600 --> 00:50:37,120
The most important thing to her
is his fitness...

306
00:50:38,440 --> 00:50:42,000
...crucial if her offspring
are to inherit genes

307
00:50:42,120 --> 00:50:44,760
essential for survival
in the highlands.

308
00:50:55,120 --> 00:50:59,080
A game of chase
is a good test of his stamina.

309
00:51:12,480 --> 00:51:15,160
She leads him to her new burrow.

310
00:51:21,600 --> 00:51:24,560
Her journey is complete.

311
00:51:27,600 --> 00:51:31,200
She's found a mate
and a new life,

312
00:51:31,320 --> 00:51:34,160
eight miles from
where she was born.

313
00:51:40,520 --> 00:51:44,800
Three weeks later,
and a new journey begins...

314
00:51:58,480 --> 00:52:00,200
...motherhood.