A two-headed red slider turtle at Big Al's Aquarium in Pennsylvania

A two-headed red slider turtle at Big Al's Aquarium in Pennsylvania.
The tortoise and turtle are scaly animals belonged to four-legged reptiles. Nation animals called (order) Testudinata (or Chelonians) is typical and easily recognizable by the 'home' or shell (Bony shell) the hard and rigid.

Tortoise shell consists of two parts. The upper part that covers the back called the carapace (carapace) and bottom (ventral, stomach) is called Plastron. Then each part is composed of two layers. Outer layers of the scales are generally in the form of large and hard, and are arranged like roof tiles, while the inner layer of bone plates such as the compact shell. The exception contained in the group of turtles-turtles (Trionychoidea) and leatherback turtles, the outer layers of dead skin scaly and was replaced on the outer layer of shell bones.

In the Indonesian language, we recognize three groups of animals that includes the nation, negates turtle (English: sea turtles), turtles, turtles or bald (freshwater turtles), and turtles (tortoises). In English, distinguished between tortoises (land tortoises) and freshwater turtles (freshwater tortoises or terrapins).