I'm certainly no expert so I'd appreciate any Jane Goodall types that want to correct me, but aren't almost all gorilla fights for dominance until someone backs down so no one gets too fucked up and rarely dies? Whereas polar bears kill to live.
Also, gorillas may have a hell of a haymaker but polar bears have big nasty fuck you claws.
Our current understanding of the big bang is not that it spread out from one place, it happened everywhere all at once. If the universe is infinite, it started from zero volume and infinite density then immediately became infinite in volume and finite in density. The density of matter/energy is what is finite, not the amount of matter/energy, that is infinite (if the universe is infinite). Then there was a period of rapid inflation, then is settled down to the inflation we see today.
Infinite or finite, the universe is not spreading out into anything, the distances between points are simply increasing.