Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Quadrupeds 4.9): The ana is an animal of the East, as Aristotle says, that is naturally very fat. Animals of this kind love each other with a wonderful love; for if they see an animal of another kind approaching one of them, as many of them as are near come together, and attack all the animals of the other kind by inflicting wounds with their teeth, either forcing them to flee or killing them completely. For animals of this kind have large and long teeth; whence it happens that if by chance this animal is attacked by some stronger animal, it certainly frees itself with the ferocity of its teeth and escapes. - [Badke translation/paraphrase]