Ruth Roberts

A documentary examining what the Tyrannosaurus Rex was really like - both appearance and behaviour - using the recent palaeontological and zoological research.

On his 89th birthday, renowned English broadcaster and naturalist Sir David Attenborough pays his first ever visit to the White House to be interviewed by one of his biggest fans, United States President Barack Obama.

Unlock the killer secrets and ingenious tactics of nature's toughest fighters in four incredible ecosystems around the world. Wild gladiators, from the smallest ants to the biggest bears, do battle for the ultimate prize: survival.