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.

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Scientists discover evolutionary link to modern-day echinoderms

The World's Rarest Turtle Has a Shot at Escaping Extinction - The New York Times

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Turtle, Species, Classification, & Facts

How Long Do Sea Turtles Live?

More than 1.1m sea turtles illegally killed over past 30 years, study finds, Oceans

Species Spotlight - Woodland Box Turtle (U.S. National Park Service)

Egg Laying or Live Birth: How Evolution Chooses

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