Turtle

Turtles are reptiles ... characterised by a special bony or cartilaginous shell developed from their ribs and acting as a shield. ... Turtles are ectotherms — their internal temperature varies according to the ambient environment, commonly called cold-blooded. However, because of their high metabolic rate, leatherback sea turtles have a body temperature that is noticeably higher than that of the surrounding water. Turtles are classified as amniotes... Like other amniotes, turtles breathe air and do not lay eggs underwater, although many species live in or around water. [Turtle. Wikipedia]