Synopsis

The programme explores the oldest lineages of reptiles: crocodiles and turtles. In the Galápagos Islands, amidst the giant tortoises, Attenborough reveals how these creatures evolved their shells as protection from predators. This is strikingly demonstrated by the eastern box turtle, whose shell incorporates a hinged ‘drawbridge’. The aquatic pig-nosed turtle presents a unique anomaly; its eggs require submersion to hatch, unlike those of other species which would drown – a point Attenborough il