Oh wow! For years I have maintained that in a fair fight between a Polar bear and a Siberian tiger, the tiger would win. And yet not a single person I've asked: "Polar bear vs. Siberian tiger?" has agreed with me.
Well check it out - a little old COUGAR fights off a Grizzly bear - which is much closer in size to a Polar bear than a cougar is to a S. tiger. And look who wins bitches!