- I can never forget arriving in Gombe for the first time, and it was my world.

- I think this one wants to bloom.

- Yes, I gotta watch it.

- London.

9 million people, two and a half million cars and miles of concrete, tarmac and steel.

- Good evening, Sir.

Where to?

- Richmond, please.

- Richmond, it is.

- But there is a wild side to London.

The desire to bring the natural world back into our cities is gaining momentum.

Now we can recognize you anywhere.

Yes, you.

Life in London clearly suits them very well indeed.

Tonight he's searching for a mate.

There they are - wild beavers in London.

You know, it's still a huge drill to see a totally wild creature.

When it comes to discovering the wonders of nature, there really is no place like home.

- What happens here is something I've been waiting to film for much of my life.

- Above flat, muddy waters, a natural wonder unfolds.

- Kind of like a, an empty stage, waiting for the players to arrive.

- The players are seabirds in the thousands.

- There is a well rehearsed choreography at work here.

Right in the heart, there's one bird, a conductor, that's driving everything.

- It's a dance between an army of prey and a single predator: the Peregrine falcon.

- It's this incredibly rich, complex drama laid out on a huge stage - two miles across, a mile high.

The air is just thick with birds.

It's a cosmic spectacle.

- She's on the road, Dan.

She's on the road.

- I can see her.

I can see her.

She's really close.

It's incredible.

She was so close to me.

Tigers are secretive and hard to track.

But here on an open island in Nepal, their lives can be filmed from the air.

Follow a team of wildlife experts as they utilize the latest technology to track three tiger moms.

- One of the cubs just walked up with something fluffy in its mouth.

- Day and night.

- She's looking right at us.

Just stay dead still.

The trials of motherhood will unfold.

- She's trying to keep him away from her cubs.

- Along with the challenges of filming wild animals.

- I think we need to back away.

This is actually a slightly dangerous situation.

There's nowhere better in the world to observe tiger behavior.

- Tigers are so much more complex, more social than we ever thought possible.

- It's very nostalgic for me because I'm right back there when it was my world.

- This is the story of the most studied chimps in the world and the woman who made them famous.

- I was seeing the chimps every day.

I knew everything about them.

They were like my family.

- The head of this family is Gremlin.

At 54 years old, she's the oldest chimp mother ever recorded.

- I wish I hadn't had to leave the forest.

They were the best days, the happiest days of my life.

- With footage collected over 65 years, a unique saga of female power and motherhood can now be told.

- It's funny.

When I was young, I used to think one day I'll be old as I am now.

And I always pictured myself sitting on a rustic seat under a tree, telling stories.

And I think the one I'm going to tell you now, it's just incredible.

- Sunrise over Kenya signals the new day, and the arrival of new friends from far away.

- Isn't this the best day ever, Elmo?

- Join Elmo, Abby Cadabby and Nina.

It's the gang from Sesame Street.

Eager to embark on an unforgettable adventure.

Wow.

- It's beautiful.

- It's so pretty.

- They will make new friends.

- Welcome to our lodge.

How's your safari been so far?

- Safari?

We haven't seen any animals yet.

- Well, a safari isn't just seeing animals in nature, safari is actually the Swahili word for journey.

- And they will face their fears.

- What's wrong?

What's wrong?

Don't worry.

That's just a lion.

- Just a lion.

Is it close?

- No, it's loud.

You can hear a lot roaring five miles away.

- Isn't it passed their bed time.

- All the fun unfolds at a very special place.

A sanctuary that rescues orphaned elephants.

- I wish I was an elephant.

Yeah, I'm a kid.

- And there's one particular elephant Elmo can't wait to meet.

- This is Nyambeni.

Hi Nyambeni, Elmo's very happy to meet you.

You know what else makes Nyambeni get excited?

Breakfast.

- Alright, let's go.

Thanks for the ride, Mister Edwin.

Elephants sure do like to walk.

- Yes.

Calves are very smart.

They learn from playing just like you.

- Look, they even walk in a line like Elmo's class at preschool.

- Every encounter teaches them about the natural world.

- Stay in your seats.

We are seeing animals in their natural habitat, and we do not want to disturb them.

- Wow!

Look at those zebras.

- Those stripes are making me dizzy.