 A depiction of a bonnacon in a medieval bestiary. |
The bonnacon (also called bonasus or bonacho) is a legendary creature described as a bull with inward-curving horns and a horse-like mane. Medieval bestiaries usually depict its fur as reddish-brown or black.[1] Because its horns were useless for self-defense, the bonnacon was said to expel large amounts of caustic feces from its anus at its pursuers, burning them and thereby ensuring its escape.