![]() However, claw-like nails are found in small-bodied callitrichids on all digits except the hallux or big toe. With the evolution of grasping hands and feet, claws are no longer necessary for locomotion, and instead most digits exhibit nails. Primate nails consist of the unguis alone, as the subunguis has disappeared. Domesticated equids ( horses, donkeys and mules) usually need regular trimming by a farrier, as a consequence of reduced activity on hard ground. Ungulates' hooves wear or self-trim by ground contact. Cats are often seen working old unguis layers off on wood or on boards made for the purpose. This process takes several months for human thumbnails. In claws, this results in an abscission layer, and the old segment breaks off. In a hair, this results in the hair falling out and being replaced by a new one. (Nevertheless, one side of the cloven-hoof of artiodactyl ungulates may also be called a claw).Įvery so often, the growth of claws stops and restarts, as does hair. A nail that is big enough to bear weight is called a " hoof". Because the dew claw does not touch the ground, it receives less wear and tends to be sharper and longer.Ī nail is homologous to a claw but is flatter and has a curved edge instead of a point. It is much less functional than the other claws but does help the cats to grasp prey. Most cats and dogs also have a dewclaw on the inside of the front paws. A claw that is retractable is protected from wear and tear. Outside of the cat family, retractable claws are found only in certain species of the Viverridae (and the extinct Nimravidae). Many predatory mammals have protractile claws that can partially hide inside the animal's paw, especially the cat family, Felidae, almost all of whose members have fully protractible claws. Claws grow out of the third phalanges of the paws and are made of keratin. Tetrapods use their claws in many ways, commonly to grasp or kill prey, to dig and to climb and hang.Īll carnivorans have claws, which vary considerably in length and shape. The unguis grows outward faster than the subunguis to produce a curve and the thinner sides of the claw wear away faster than their thicker middle, producing a more or less sharp point. The claw grows outward from the nail matrix at the base of the unguis and the subunguis grows thicker while travelling across the nail bed. The subunguis is the softer, flaky underside layer whose grain is parallel to the direction of growth. ![]() The unguis is the harder external layer, which consists of keratin fibers arranged perpendicular to the direction of growth and in layers at an oblique angle. In tetrapods, claws are made of keratin and consist of two layers. Claw-like projections that do not form at the end of digits but spring from other parts of the foot are properly named spurs. Similar appendages that are flat and do not come to a sharp point are called nails instead. Claws are used to catch and hold prey in carnivorous mammals such as cats and dogs, but may also be used for such purposes as digging, climbing trees, self-defense and grooming, in those and other species. The pincers of crabs, lobsters and scorpions, more formally known as their chelae, are sometimes called claws.Ī true claw is made of a hard protein called keratin. Some invertebrates such as beetles and spiders have somewhat similar fine, hooked structures at the end of the leg or tarsus for gripping a surface as they walk. A domestic cat's retractable claw in protracted positionĪ claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes ( mammals, reptiles, birds).
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