Total change of evolutionary theory.

[alien space marine]

What would cause dark polar bears to not survive in a snowy environment, thus ushering in an evolution of only white polar bears (except for the occasional offspring carrying the recessive gene for dark hair)? I mean, I understand that camouflage is the reason animals such as white rabbits can survive in snowy environments where dark rabbits can't, but do polar bears even have predators to worry about? They pretty much are the ultimate predators in their environment, not counting humans, who can't legally kill a polar bear now due to their classification as endangered. Are white polar bears simply better adapted to colder conditions than brown bears?

Being white would make them more stealthy hunters

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Cats have barbed penises , That's why she cats squeal when their being drilled.