Pissing on the border

I just came across an interesting argument in the battle for private property legitimacy (not that this is seriously in dispute, but some philosophers have considered it destructive to human organization):

"property is no mere social convention or game, but a critically important evolved mechanism for the avoidance of violence." [Raymond, E. from The Cathedral and the Bazaar]

Ironically, in searching for information on the subject, I came across more articles written to teach us how to dissuade domesticated animals from doing it than I did articles to understand why we humans seem to find it so necessary.

Yeah, those pissing animals are nothing like us.