Koopa
Koopa is the name of many of the characters in the Mario games. There appear to be two distinct species of koopa. One, the koopa troopa, is essentially turtle-like and usually has either a red or a green shell. See the articles on Koopa Troopa and Koopa Para-Troopa for more.
The second species is represented by King Koopa (Bowser) and his children. They are bipedal reptiles with spiked shells, claws, horns and (strangely enough, for reptiles) hair. They can also breathe fire. These koopas are intent on conquering various kingdoms, and use the more turtle-like koopa troopas as soldiers.
