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Characteristics

All members of the cat family have the following characteristics in common:

The colour, length and density of their fur are very diverse. Fur colour covers the gamut from white to black, and fur patterns from distinctive small spots, and stripes to small blotches and rosettes. Most cat species are born with spotted fur, except the jaguarundi (Herpailurus yagouaroundi), Asian golden cat (Catopuma temminckii) and caracal (Caracal caracal). The spotted fur of lion (Panthera leo) and cougar (Puma concolor) cubs change to uniform fur during their ontogeny. Those living in cold environments have thick fur with long hair, like the snow leopard (Panthera uncia) and the Pallas's cat (Otocolobus manul). Those living in tropical and hot climate zones have short fur. Several species exhibit melanism with all-black individuals.

In the great majority of cat species, the tail is between a third and a half of the body length, although with some exceptions, like the Lynx species and margay (Leopardus wiedii). Cat species vary greatly in body and skull sizes, and weights:

Most cat species have a haploid number of 18 or 19. Central and South American cats have a haploid number of 18, possibly due to the combination of two smaller chromosomes into a larger one.

Felidae have type IIx muscle fibers three times more powerful than the muscle fibers of human athletes.