Scientists Discover That Turtles Began Living in Shells Much Earlier Than Once Thought

Unique among Earth’s creatures, turtles are the only animals to form a shell on the outside of their bodies through a fusion of modified ribs, vertebrae and shoulder girdle bones. The turtle shell is a unique modification, and how and when it originated has fascinated and confounded biologists for more than two centuries.

Sea Turtles Smithsonian Ocean

The insight of Darwin's work on corals, worms and co-evolution

Newdesk Search, Page 312

Newdesk Search, Page 314

Paleozoic U.S. Geological Survey

600 Million Years: Victoria Evolves - Melbourne Museum

Turtles have lived for 230 million years - but will they survive

Newdesk Search, Page 314

10 totally awesome facts about turtles! - National Geographic Kids