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
Learn more about your ad-choices at https://www.iheartpodcastnetwork.com
See omnystudio.com/listener for privacy information.