Territoriality isn't just about living somewhere though, it's about excluding conspecifics from a home range through physical attack, visual display, scent, etc. Diet is a major factor in whether an animal will be territorial. Gorillas, being folivores, are not, whereas chimpanzees, being primarily frugivores, are. Competition for mates is also a significant factor in territoriality, and this type of territoriality occurs in everything from songbirds to beetles.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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