Family Felidae (cats) are the most widespread of the "cat-like" carnivorans. There are 41 extant species, and all but a few have retractile claws. This family is represented on all continents except Australia (where domestic cats have been introduced) and the Antarctic. The species vary in size from the tiny black-footed cat ("Felis nigripes") at only 2 kg (4.5 lb) to the tiger ("Panthera tigris") at 300 kg (660 lb). Diet ranges from large to small mammals, birds and insects (depending on species size).