Claw

talonsclawstalonhallux clawhallux-clawhoofchelachelipedshoovedTalon (anatomy)
A claw is a curved, pointed appendage, found at the end of a toe or finger in most amniotes (mammals, reptiles, birds).wikipedia
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Keratin

keratinizationkeratinouskeratinized
A true claw is made of hard protein called keratin. Claws grow out of the third phalanges of the paws and are made of keratin. In tetrapods, claws are made of keratin and consist of two layers.
It is the key structural material making up hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates.

Nail (anatomy)

nailnailsfingernail
Similar appendages that are flat and do not come to a sharp point are called nails instead.
Nails evolved from claws found in other animals.

Spur (zoology)

spurspurs
Claw-like projections that do not form at the end of digits, but spring from other parts of the foot are properly named spurs.
Unlike claws or nails, which grow from the tip of the toes, spurs form from other parts of the foot, usually in connection with joints where the toes meet the foot or the foot meets the long bones.

Predation

predatorypredatorprey
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.
Many predatory animals, both vertebrate and invertebrate, have sharp claws or jaws to grip, kill, and cut up their prey.

Felidae

wild catfelidfeline
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.
Cats have retractile claws, slender muscular bodies and strong flexible forelimbs.

Paw

padspawsfoot
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.
A paw is the soft foot-like part of a mammal, generally a quadruped, that has claws.

Carnivora

carnivorescarnivorancarnivorans
All carnivorans have claws, which vary considerably in length and shape.
Most carnivorans are terrestrial; they usually have strong, sharp claws, typically with five, but never fewer than four, toes on each foot, and well-developed, prominent canine teeth, cheek teeth (premolars, and molars) that generally have cutting edges.

Viverridae

viverridviverridscivet
Outside of the cat family, retractable claws are found only in certain species of the Viverridae (and the extinct Nimravidae).
Viverrids have four or five toes on each foot and half-retractile claws.

Phalanx bone

phalangesphalanxproximal phalanx
Claws grow out of the third phalanges of the paws and are made of keratin.
The distal phalanges of ungulates carry and shape nails and claws and these in primates are referred to as the ungual phalanges.

Abscission

absciseabscission layerabscission zone
In claws, this results in an abscission layer, and the old segment breaks off.
In zoology, abscission is the intentional shedding of a body part, such as the shedding of a claw, husk, or the autotomy of a tail to evade a predator.

Grooming claw

toilet-clawtoilet claw
A laterally flattened grooming claw, used for grooming, can be found on the second toe in living strepsirrhines, and the second and third in tarsiers.
A grooming claw (or toilet claw) is the specialized claw or nail on the foot of certain primates, used for personal grooming.

Bird of prey

birds of preyraptorraptors
A talon is the claw of a bird of prey, its primary hunting tool.
Additionally, they have keen eyesight for detecting food at a distance or during flight, strong feet equipped with talons for grasping or killing prey, and powerful, curved beaks for tearing flesh.

African clawed frog

Xenopus laevisXenopusX. laevis
The only amphibians to bear claws are the African clawed frogs.
Its name is derived from the three short claws on each hind foot, which it uses to tear apart its food.

Hoof

hooveshoovehooved
A nail that is big enough to bear weight is called a "hoof".

Cassowary

cassowariesCasuariusCassowary ''(kasuaris in Dutch)
Cassowaries use claws on their inner toe (digit II) for defence, and have been known to disembowel people.
Cassowaries have three-toed feet with sharp claws.

Chela (organ)

chelaechelipedchela
Crabs', lobsters' and scorpions' pincers, or more formally, their chelae, are sometimes called claws.
Another name is claw because most chelae are curved and have a sharp point like a claw.

Amniote

Amniotaamnioteshigher vertebrates
A claw is a curved, pointed appendage, found at the end of a toe or finger in most amniotes (mammals, reptiles, birds).

Mammal

mammalsMammaliamammalian
A claw is a curved, pointed appendage, found at the end of a toe or finger in most amniotes (mammals, reptiles, birds).

Reptile

reptilesReptiliaSauropsida
A claw is a curved, pointed appendage, found at the end of a toe or finger in most amniotes (mammals, reptiles, birds).

Bird

birdsAvesavian
A claw is a curved, pointed appendage, found at the end of a toe or finger in most amniotes (mammals, reptiles, birds).

Invertebrate

invertebratesmacroinvertebratemacroinvertebrates
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 the creature walks.

Arthropod leg

legstarsicoxa
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 the creature walks.

Tetrapod

tetrapodsTetrapodaland vertebrates
In tetrapods, claws are made of keratin and consist of two layers.

Anatomical terms of motion

flexionextensionabduction
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.

Nimravidae

nimravidnimravidsfalse saber-toothed cat
Outside of the cat family, retractable claws are found only in certain species of the Viverridae (and the extinct Nimravidae).