Piranha

Did you know that there are at least twenty-five different kinds of piranhas? Most have deep flat bodies, range in color from olive green to blue black, and have red orange bellies.
The most dangerous of the species have large very sharp teeth, the upper and lower set which fit perfectly together. These remarkable fishes have other characteristics which enhance their biting ability. Their lower jaws are sturdy and they swing shut at an angle that gives maximum leverage. Their deep flat bodies which offer resistance when
swung sideways through the water add to the leverage. …