The animal world is full of spectacle and wonder.
But what's it like to be right in the heart of the action?
To find out, our team of spy creatures goes undercover.
They not only look like the animals they film...
...they behave like them, too.
Armed with the latest camera technology...
...they are heading across the globe.
From the heat of the Tropics...
...to the lands that lie in the north.
From the islands of the Southern Seas...
...to the snow and ice of the frozen poles.
Our spies reveal the astonishing variety of life that thrives there,
from inside their world.
On this assignment, our spy creatures join the animal families
that dwell in the hot and humid Tropics.
In the tropical zone, life is abundant,
and the dry and rainy seasons
influence animals in remarkable ways.
When the dry season comes to the mountains of Uganda,
it brings cool nights and warm days.
As the morning mist clears, a glimpse of the wonders to come.
For now, there's just one, lone baby.
His camera eye the only clue he's not as real as he seems.
His aim - to join this family of mountain gorillas.
But, first, he must gain their trust.
One wrong move and it could all be over.
They are a close-knit family.
They don't take kindly to strangers.
He offers a hand of friendship.
Will they accept his introduction?
A promising start,
but, somehow, he must convince everyone.
She peers into his eyes to make a connection.
Gorillas learn a lot from each other this way.
But he remains inscrutable, as ever.
Now it's the baby's turn.
Gorillas are very tactile.
A touch is an invitation to get to know each other.
But is it all too good to be true?
The great silverback.
He won't be so easily impressed.
Here, he's the boss.
Spy Gorilla won't be welcomed without his say-so.
Everyone must stay back.
Can our spy win him over, too?
They await the silverback's decision.
Until then, there's a line no-one can cross.
His arm, a barrier between them and the newcomer.
To show respect, our spy averts his gaze.
Spy Gorilla can stay.
Everyone can relax once more.
In adults, chest-beating is a show of power.
For youngsters, it's an invitation to play.
But games easily get out of hand.
His look says it all.
Best pretend it never happened.
But it's not the end for our spy.
He lives to film another day.
The dry season has also come to Brazil.
The Pantanal is the world's largest tropical wetland.
But, at this time of year, it's drying out fast.
Life gathers in spectacular abundance
around the few pools of open water that remain.
As well as egrets, caiman congregate in their thousands,
some of the 10 million found across the Pantanal.
Such abundance attracts other predators.
Meet the world's first Spy Jaguar cub.
Caiman are the jaguar's favourite prey.
But they have little to fear from a solitary cub.
Having basked in the sun, they're primed and eager to hunt.
Spy Caiman is ready and waiting.
He's now just one of the locals.
Wherever they go, he goes, too.
It's soon clear why everyone is here -
thousands of fish are trapped in the vanishing pools.
But there is little oxygen in these waters.
And, as the day warms, it holds even less.
The caiman is ready.
Catfish are coming to the surface for air.
All good things come to those who wait.
It's a feeding frenzy.
The morning feast lasts just a brief moment.
Soon, everyone can eat no more.
Only now do the capybara venture out.
They're the world's largest living rodent,
and one of the most intelligent.
They welcome the dry land that's now appearing.
It's perfect for a spot of sunbathing.
But they must keep their wits about them.
Something else now piques his interest.
Jaguars kill the cubs of others.
But curiosity overcomes aggression.
This isn't the only jaguar here.
Jaguars are fiercely territorial.
The result is a draw.
Neither willing to risk their life.
Is this the reason for the brawling?
A partner worth fighting for?
In courtship, it seems, the female takes control.
Having put him in his place, she turns on the charm.
A rarely-filmed moment of tranquillity
in one of the busiest wildlife spots on Earth.
Costa Rica is next to host one of the Tropics' great events.
Black vultures gather in anticipation.
This year, they have company.
A vulture that can film.
The gathering begins on the third quarter of the moon,
when the tides are at their minimum.
Olive ridley turtles.
Many travelled over 1,000 miles to get here.
They're returning to the beach where once they were born.
When the tide is out and the surface calm,
they come ashore.
Where one leads, others follow.
For those breeding for the first time,
15 years have passed since they hatched on this very beach.
Now, they compete for a place to lay eggs of their own.
This is the great turtle arribada.
20,000 may arrive in a single day.
Only so much can be seen from the air.
As they keep coming, so do our spy creatures.
Spy Turtle is here, as our eyes on the ground.
Turtles lay above the high water mark.
So, first, our spy must climb the beach.
In water, turtles are effectively weightless.
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