Page 107 - Sex Facts
After airing the South Park episode "200", the makers Trey Parker and Matt Stone received death threats from a radical Muslim group.
The episode was lampooning, among other things, the fact that the prophet Muhammad is not supposed to be depicted visually. As a joke the episode depicted a "Muhammad" character dressed up in a bear suit (so that people can't see him).
A website called "RevolutionMuslim.com" placed a warning for the writers of the show, Matt Stone and Trey Parker. The warning stated that Stone and Parker "will probably wind up like Theo Van Gogh" (referring to a Dutch filmmaker who was assassinated over how he portrayed Muslim women.)
They also growl, chomp their teeth, and snort. Polar bear cubs also hiss and cry for various reasons.
Legend has it that polar bears cover their black noses to better camouflage themselves in the white snow, but scientists who have observed polar Bear behavior have never seen this.
Furthermore, polar bears are not left-handed (or left-pawed). They use their left and right paws equally.
Another cool fact: As you can see in the picture, sometimes polar bears play with dogs. More pictures here!
(Sources: 1, 2)