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.

How did the turtle get its shell? Fossil discovery gives us a clue

Ornate Box Turtle Missouri Department of Conservation

How did the turtle get its shell? - The Official PLOS Blog

All but Ageless, Turtles Face Their Biggest Threat: Humans - The New York Times

Crab Love in the Garbage Patch - News

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Newdesk Search, Page 314

Common And Rare Types Of Shells Found On The Beach

News Releases, Page 125

It's Turtles All the Way Down in the Fossil Record - The New York Times

Sea Turtles: The Ultimate Expert Guide — The State of the World's Sea Turtles

Ammonites - British Geological Survey