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Probably the main reason why males kill the offspring of other males of the same species is that there are limited resources available to the raising of offspring, so if a male gets rid of another male's offspring it enhances the chances of survival for his own offspring. Therefore, males that are adept at doing this will have more offspring that in turn will have similar genes driving them towards the same behaviour and so it continues.
Permalink Mon, 02 Jul 2012 10:18:50 UTC | #948451