BBC - David Attenborough's Natural Curiosities Series 4 (2018) Part 5 Incredible Shells

David Attenborough's Natural Curiosities Series 4

Sir David Attenborough examines the mysteries behind some of nature's most fascinating creatures and plants.

Part 5 Incredible Shells

David Attenborough investigates two shells that have proved to be winners in evolution the tortoise's shell and the shells of birds' eggs. The ostrich egg is so strong it is possible for a person to stand on it without it breaking, but how does the chick break out of this 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.

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