Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.31): Duran is an animal, as Aristotle says, cruel, swift, and very strong. When this animal is chased by hunters and in despair, seeing that it cannot escape, with natural cunning turns itself very strongly against the pursuing dogs using its dung to retard them by the rottenness of the digestion and the smell. - [Badke translation/paraphrase]

Vincent de Beauvais [circa 1190-1264 CE] (Speculum naturale, Book 19.36): Perhaps also by this name, duran is the beast which according to the Aristotle was called "bonassus", and it is itself, as it seems, a wild cow, of which Aristotle says that it has horns inclined towards each other. And therefore nature has given it another aid, namely, the ejection of dung into the distance, so that it may keep the hunter from approaching it. - [Badke translation/paraphrase]