Nathaniel C. Comfort, The Tangled Field: Barbara McClintock's Search for the Patterns of Genetic Control (2003) p. 29:She recalled that mcclintock enjoyed the aesthetics of tushes. ... "It wasn't just guys' tushes and it wasn't just girls' tushes, it was just tushes."
Blackwood's Magazine (1980) p. 769:A boar carries two pairs of tushes, one pair sharp-pointed and sharp-edged and ... When he has his mouth closed the sharp lower tushes are in a way sheathed against the blunt upper tushes...