Turtle shells evolved over the course of 300 million years, but self-defense wasn't the initial driver, researchers think.

Add Yahoo as a preferred source to see more of our stories on Google. Turtles and tortoises are both reptiles with shells, but they're not exactly the same. So how can you tell them apart? What's the ...

It's easy to understand why so many use the words "turtle" and "tortoise" interchangeably. They look similar with their characteristic bony shells and lipless expressions, and, in some cases, they ...

A 260 million-year-old fossil has been determined to be the oldest ancestor of turtles found to date, revealing something about the reptile's mysterious past. Back in the olden days, or rather 260 ...

What do you think of when you hear the word “tortoise”? The giant tortoises that lumber along like tanks over the Galapagos Islands in the Pacific and the Seychelles in the Indian Ocean? The gopher ...

Footage shows three small turtles appearing to help a larger turtle after its shell became stuck between a pool railing. Two ...