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David Attenborough's Natural Curiosities Season 4 Episode 5 Incredible Shells 2017

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.

  • Released: 2017-06-25
  •   Runtime : 22 minutes
  •   Genre : Documentary
  •   Stars : David Attenborough
  •   Director :