A claw's 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, the word "claws"'s most often used in reference to an invertebrate. For example, the crab's and lobster's claws or pincers, or more formally, their "chelae". A claw's made of hard protein called keratin… (More on Claw)