S1E4:A Curious Twist
David Attenborough's Natural Curiosities
19 Feb 2013TV-G
Both the narwhal and the snail have developed a twist. The narwhal has its ferocious tusk while the humble snail carries its chic mobile home on its back. In this curious natural history documentary, David Attenborough questions why spirals are so widespread in nature. He gleans some answers by looking at a variety of animals that feature a spiral in their physical make up.
