A claw is a curved, pointed appendage, found at the end of a toe or finger in most mammals, birds, and some reptiles. Somewhat similar fine hooked structures are found in arthropods such as beetles and spiders, at the end of the leg or tarsus for gripping a surface as the creature walks. However, when most people use the word "claws" in reference to an animal without a backbone, they mean crab or lobster claws or pincers, more formally known as "chelae". A claw is made of hard protein. Claws a… (More on Claw)