David Attenborough's Natural Curiosities - Season 4 Episode 5 Incredible Shells
David Attenborough investigates two shells that have proved to be winners in evolution: the bird’s shell and the hard shell of the tortoise. The ostrich egg is so strong it’s possible for a person to stand on it without it breaking – 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.
First Air Date: Jan 29, 2013
Last Air date: Jun 25, 2017
Season: 4 Season
Episode: 27 Episode
Runtime: 26 minutes
IMDb: 7.30/10 by 18.00 users
Popularity: 1.5126
Language: English
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