[ncmncm]

Other species have mostly arranged not to kill one another in these competitions. E.g. vipers & komodo dragons don't bite while wrestling. Walruses get pretty ripped-up, but usually don't die.

Ganging up to kill seems to be mostly a primate thing.

[inglor_cz]

Fighting is only a subset of competition.

Male lions will kill cubs fathered by another male without remorse. It is not the same as our primate instincts of war, but remarkably close to ethnic cleansing.