The chicks are growing up fast and becoming increasingly independent.
Chicks are hatching all over! Male emperors form an identity parade before handing over their newborns to the returning females.
Emperor penguins cross a treacherous frozen sea to reach their breeding grounds. They must lay their eggs without touching the ice. Rockhoppers brave the world's stormiest seas, only to come ashore and face a daunting 300-foot cliff.
Underwater cameraman Paul Atkins films a great white shark.
Watch the lives and toils of the arctic polar bear.
David Attenborough narrates an unusual documentary look at the behaviour and intelligence of an African elephant herd.
One of the most successful species on the planet is also one of the least documented. Miniaturized cameras show the snakes' world for the first time from their point of view.
The alliances between rival pride males; fights, pride take-overs and infanticide.