A nail is a horn-like envelope covering the dorsal aspect of the terminal phalanges of fingers and toes in humans, most non-human primates, and a few other mammals. Nails are similar to claws, which are found on numerous other animals. In common usage, the word nail often refers to the nail plate only. Fingernails and toenails are made of a tough protein called keratin, as are animals' hooves and horns. Along with hair they are an appendage of the skin.
Fingernails
Toenails
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