The use of metaphors from zoology, such as referring to politicians as rats or hyenas, is what the linguistic researcher Aida Sakalauskaite calls "zoometaphors"[12] and Grzegorz A. Kleparski calls "zoosemy",[13][14] the use of metaphors from zoology. In each of three different languages, English, German, and Lithuanian, the most common animal categories are farmyard animals (40% in English), Canidae (including dog and wolf, 6% in English), and birds (10% in English). Grammatically, metaphor, as in "sly fox", is not the only option: speakers may also use simile, as in "deaf as an ass".