Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.8) : The ahane is an animal, so says Aristotle, approximately the size of a deer, in which nature changed the habit of other animals with four legs. For, every animal with four feet has a gallbladder in the interior of the belly, but this one does not. On the other hand, this animal has a gallbladder in its ears. And the gallbladder itself of the animal is similar to the gallbladder of a human in color; and the gallbladder itself is strongly bitter and causes violent anger and aggressiveness. - [Translation from The Thomas Project]