David Attenborough's Natural Curiosities
Incredible Shells
Season 4 Episode 5 of 6
The veteran naturalist investigates two shells that have proved to be winners in evolution - the bird's egg shell and the hard shell of the tortoise. The ostrich egg is so strong it is possible for it to take a person's weight without breaking - so how does a chick manage break out of such a fortress? The evolution of the tortoise shell was for a long time a mystery, and this bony box offers a lot more than just protection
David Attenborough's Natural Curiosities airs on U&Eden HD at 5:30 AM, Friday 20 December. (Subtitles, audio description.)
Topics
Education ➝ Science ➝ Factual Topics
Nature ➝ Animals ➝ Environment
David Attenborough
Presenter
Hilary Jeffkins
Director
Stephen Dunleavy
Executive Producer