BrainStuff Classics: Why Do Turtles Have Shells?

It seems obvious that turtles' shells would have evolved to protect them from predators, but researchers have found that they probably first evolved to help turtles dig. Learn what that's all about in this classic episode of BrainStuff, based on this article: https://animals.howstuffworks.com/reptiles/real-reason-turtles-have-shells-hint-its-not-protection.htm

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