Dewclaw
A digit on the foot of many mammals, birds, and reptiles / From Wikipedia, the free encyclopedia
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A dewclaw is a digit – vestigial in some animals – on the foot of many mammals, birds, and reptiles (including some extinct orders, like certain theropods). It commonly grows higher on the leg than the rest of the foot, such that in digitigrade or unguligrade species, it does not make contact with the ground when the animal is standing. The name refers to the dewclaw's alleged tendency to brush dew away from grass.[1] On dogs and cats, the dewclaws are on the inside of the front legs, similarly to a human's thumb, which shares evolutionary homology.[2] Although many animals have dewclaws, other similar species do not, such as horses, giraffes and the African wild dog.