Memorable moments from the series so far...
Cuckoo catfish have a truly shocking start to life.
Brown hyenas in the Namib desert make a home in a disused diamond mine.
Chimps take several years to perfect the skills required for cracking a nut.
Polar bears use an ambush technique when hunting belugas.
Grey mullet cause a feeding frenzy on the surf beaches of Florida.
Prairie dog pups get rescued from an American badger by another resident on the plains.
Today's the day the coastal bears have their picnic.
The Iberian lynx has become the conservation icon of Spain.
A hungry wild hamster in an Austrian graveyard bites off more than it can chew.
Thirsty bats get more than they bargained for when swooping in a river to cool down.
A male Jotus spider waves it paddle-like limbs to attract a mate.
How to catch an animal that's faster than you.
A baby cassowary is split up from its father and faces the dangers of the jungle.
Fledging dusky swifts have never seen the world beyond the torrents of Iguazú Falls.
A mother puma takes on South America's most challenging prey.
A father poison dart frog needs to relocate his tadpole.
For life in Brazilian rivers, lunch is sometimes found above the water.
A flycatcher thinks it has found a spider for lunch.
Walrus in northern Russia have a clifftop encounter with a polar bear.
Deep within the mountain forests of China, snub nosed monkeys wage war.
Sir David Attenborough witnesses dramatic deforestation in Borneo through the years.
An unnaturally strong storm separates an albatross chick from its parents' nest.
Crumbling glaciers give the advantage to leopard seals hunting penguins.
Humpback whales blow bubbles that rise up in a spiral to trap their prey.