A domestic cat's retractible claw (top center), which looks like a curved needle or hook point

A crab with 2 crab claws (top center) which can grab or tear at fish.

A claw is a sharp object. It is found at the end of a toe or finger in many mammals, birds, and some reptiles. The word "claw" is also used in reference to an invertebrate. For example, the chelae of crabs and lobsters are often called claws or pincers.