There is no such native resistance. It's all cultural conditioning coupled with deterrence created by state-imposed punishments. Animals have been killing other animals over resources and for recreation since before they emerged from the primordial soup.
False. Not with their own species. They are being gentle with each others in their mating and territorial rituals, competitions.
>>Animals have been killing other animals over resources and for recreation since before they emerged from the primordial soup.
And humans were pretty darn good at it long before FPS videogames and auto-loading rifles with box magazines. Just ask the adversaries of Ghengis Khan or Julius Caesar, for some good historical examples.