Segments in this Video

Tortoises and Turtles (10:31)


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.

Bird Eggs (09:28)

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 (00:33)

Credits: Incredible Shells

For additional digital leasing and purchase options contact a media consultant at 800-257-5126
(press option 3) or

Incredible Shells

Part of the Series : Attenborough's Natural Curiosities, Series 4
DVD (Chaptered) Price: $300.00
DVD + 3-Year Streaming Price: $450.00
3-Year Streaming Price: $300.00



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

Item#: BVL145481

ISBN: 978-1-64347-229-4

Copyright date: ©2016

Closed Captioned

Performance Rights

Prices include public performance rights.

Not available to Home Video and Publisher customers.