Aggression (animal behavior)

Definition and stakes

George Catlin,  Illustrations of the manners, customs… (1876)

“ I defy the world to produce another animal than can look so frightful as a huge buffalo bull, when wounded as he was, turned around for battle, and swelling with rage;—his eyes bloodshot, and his long shaggy mane hanging to the ground,—his mouth open, and his horrid rage hissing in streams of smoke and blood from his mouth and through his nostrils, as he is bending forward to spring upon his assailant. ”
Source: Gutenberg

Portrait of C. Lloyd Morgan C. Lloyd Morgan,  Animal Behaviour

“ The blood-system, respiratory organs, and all his inner machinery are still pulsating with nervous thrills; his back is up. Then he sees his chance, and flies at his opponent. Much that he has learnt in play, and all that he has learnt in earnest, comes to his aid in the short angry scuffle. And what we call his emotion of anger spurs him on to the fight; the cowardly dog in which this is lacking or is replaced by fear is spurred to flight. Each may contribute to self-preservation, but in different ways. ”
Source: Gutenberg

James Law,  Text book of veterinary medicine… (1902)

“ Loud and terrified bellowing is not uncommon, switching of the tail, drivelling of saliva, and exceptionally 277there are attempts to bite. More commonly the natural weapons of offense are employed, the animal kicks, stamps, paws and, above all, tries to gore man or beast, but especially any dog which may appear. They even make such attacks on purely imaginary beings and without any real, tangible enemy present. ”
Source: Gutenberg

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