David continues by highlighting two animals that some people thought were faked - the duck-billed platypus and the midwife toad; encounters two species that age differently - the mole rat retains its looks while growing old and the elephant looks old from birth; and questions why spirals are so widespread in nature, focusing on the narwhal's tusk and shells found on snails and ammonites.
The first two series of the documentary presented by esteemed British wildlife commentator David Attenborough exploring some of the natural world's greatest curiosities. Among the issues examined by Attenborough are the role electric eels played in human research into electricity and other quirks in animals that have proved interesting to scientists and researchers. The broadcaster also looks at pairs of animals that share certain traits such as the emperor penguin and wood frog, both of which can live in exceptionally cold conditions; the rhino and the hedgehog, which possess formidable defences to deter predators; and gorillas and vampire bats, which have a reputation for aggression that is largely unwarranted by their behaviour.
All six episodes from the third series of the documentary presented by esteemed British naturalist David Attenborough exploring some of the natural world's greatest curiosities. Among the issues examined by Attenborough are IQ research on orangutans and crows, the eating methods of large constrictor snakes and the powers of regeneration. The episodes are: 'Impossible Feats', 'Curious Minds', 'Expandable Bodies', 'Curious Feeders', 'Curious Cures' and 'Remarkable Regeneration'.