Changes

Turtles come in a great variety of shapes and sizes. There are species only 6 inches in diameter (for example the [[North American box turtle]]), and the [[giant leatherback sea turtle]], which may attain lengths of up to 8 feet.

Turtles come in a great variety of shapes and sizes. There are species only 6 inches in diameter (for example the [[North American box turtle]]), and the [[giant leatherback sea turtle]], which may attain lengths of up to 8 feet.

The upper shell of the turtle is called the [[carapace]], and the lower is called the [[plasmon]]; their structures varying among different turtles. Some of the aquatic turtle species, the [[soft-shelled turtles]], have their carapace covered with [[leather]]y skin.

The upper shell of the turtle is called the [[carapace]], and the lower is called the [[plastron]]; their structures varying among different turtles. Some of the aquatic turtle species, the [[soft-shelled turtles]], have their carapace covered with [[leather]]y skin.

Turtles have no [[teeth]] but a horny sharp [[beak]] instead. They also lack a [[breastbone]], and their [[heart]] has three chambers like the heart of other reptiles, with the noted exception of [[crocodile]]s.

Turtles have no [[teeth]] but a horny sharp [[beak]] instead. They also lack a [[breastbone]], and their [[heart]] has three chambers like the heart of other reptiles, with the noted exception of [[crocodile]]s.