Scientists Discover That Turtles Began Living in Shells Much

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

New Fossil Shows How the Turtle Got Its Shell

Green Turtle - National Maritime Historical Society

Scientists discover that turtles began living

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Do Clams Hold the Secret to Old Age? - The Atlantic

Turtles - Say Rhymes

Scientists Discover 230-Million-Year-Old Turtle That Had No Shell

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