In zoology, a claw is a narrow, arched structure that curves downward from the end of a digit in birds, reptiles, many mammals, and some amphibians. It is a hardened (keratinized) modification of the epidermis. Claws may be adapted for scratching, clutching, digging, or climbing.

A claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes (mammals, reptiles, birds). 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 chela (/ ˈ k iː l ə /) – also called a claw, nipper, or pincer – is a pincer-shaped organ at the end of certain limbs of some arthropods. [1] The name comes from Ancient Greek χηλή, through Neo-Latin chela. The plural form is chelae. [2] Legs bearing a chela are called chelipeds. [3]

The anatomy of the claw retractile mechanis … Recent behavioral studies have shown the primary organ of prehension used in capturing prey to be the claw equipped forelimbs. In light of its functional importance, the claw retractile mechanism for 15 felid species is described and its function studied .

In this study, the functional morphology of vertebrate claws is analyzed using measurements taken from 80 modern claw specimens spanning birds, mammals, and one reptile. Claw measurements were chosen for their potential biomechanical significance and a revised, expanded categorization of claw function is defined and used.

2021年3月31日 · Claws are found in a huge range of vertebrates, ranging from reptiles and birds to mammals. These pointed structures at the tips of digits, usually covered by a sheath of keratin, come in a wide variety of shapes and sizes that can vary considerably between species and even between limbs or digits of an individual.

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 …

The nails or claws are shells of hard keratin, produced by the epidermis that covers the terminal portion of P3 on each digit, including the rudimentary 1st digit. You might find these chapters and articles relevant to this topic. John G. Fleagle, in Primate …

Our analysis of the morphology of the cornified claw sheath of domesticated cats was originally conceived as a preliminary study using easily obtainable specimens, which would prepare the ground for a better understanding of the structure and internal architecture of the rhamphotheca of the curved beaks of parrots (see Homberger, 2001).

A claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes (mammals, reptiles, birds). A true claw is made of a hard protein called keratin. Similar appendages that are flat and do not come to a sharp point are called nails instead.