An animal epithet is a name used to label a person or group, by association with some perceived quality of an animal. Epithets may be formulated as similes, explicitly comparing people with the named animal, as in "he is as sly as a fox", or as metaphors, directly naming people as animals, as in "he is a [sly] fox". Animal epithets may be pejorative, of negative character, or positive, indicating praise.
Animal similes and metaphors have been used since classical times, for example by Homer and Virgil, to heighten effects in literature, and to sum up complex concepts concisely.
Surnames that name animals are found in different countries. They may be metonymic, naming a person's profession, generally in the Middle Ages; toponymic, naming the place where a person lived; or nicknames, comparing the person favourably or otherwise with the named animal.