Some animals appear to have stretched their natural gifts to the limits. Sir David Attenborough looks at the giraffe, who must reach the tallest branches to find food, and the chameleon, who must use their camouflage to hide from predators.
Sir David Attenborough reveals nature's evolutionary anomalies. Here he looks at the platypus and the curious case of the male Midwife Toad.
Sir David Attenborough looks at some amazing quirks of evolution. David encounters two examples where nature has tinkered with the ageing process.
David Attenborough reveals nature's most amazing animals. A look at the tusk of the narwhal and the spiral shells found on snails and ammonites.
Sir David Attenborough shines the spotlight on nature's most amazing animals. David looks at the zebra's stripes and the wings of the butterfly.