Live Science on MSN
Can a turtle tuck its head all the way inside its shell?
Turtle shells evolved over the course of 300 million years, but self-defense wasn't the initial driver, researchers think.
Why are we asking for donations? Why are we asking for donations? This site is free thanks to our community of supporters. Voluntary donations from readers like you keep our news accessible for ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results