Fingernail
A 'fingernail' is a hard part of the body at the tip of the fingers, of which most people have ten. Toenails are similar, except that they grow four times slower and are on the toes. Only mammals have fingernails. Like hair, fingernails never stop growing. They must be cut from time to time. It does not hurt when you cut your nails. The nails are made up of a protein called keratin.