Cats rarely fight over territory: that dreadful caterwauling you hear in the night is not actual violence but a pantomime of threatened violence that usually ends with one feline slinking off after deciding that the other is the likely victor of any physical contest. It's the same in most of the animal: after sizing up the opposition, one contestant defers to greater implied strength and backs down. The tiny goby fish that live in waterholes in Australia's central desert are different.

Little fish comes out fighting. (2012, September, 20). Manila Bulletin, p. B-8.