Tortoise and turtle shells grow with the animal and provide protection; their ribs fuse with the shell to provide extra strength. Shells have changed overtime depending on the animals' environment.
Egg shells must be strong enough to provide protection and fragile enough for the chick to break out. Eggs have different shapes and colors to provide the best incubation and are covered in pores to allow oxygen and water in and waste out. Ostriches produce the largest eggs.
Credits: Incredible Shells
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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.
Length: 23 minutes
Copyright date: ©2016
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