David Attenborough's Natural Curiosities - Season 4 (2017) (Seizoen)
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Groot Brittanië,
2017, 29 min
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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. (BBC)
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