turtle

Turtles and turtles are legged four-legged animals belonging to the reptile. The animal nation called Testudinata is distinctive and easily recognizable by the presence of a 'house' or a hard and rigid shell

We often never think deeply how incredible turtle shells are. Unlike other shelled animals (shells, shells, shells), the oldest reptils on planet Earth that still exist, can not get out of the shell because the shell on the turtle is part of a hard and rigid bone structure.