Because They Live In Snowy Areas. Snowy Areas Such As Antartica And The Arctic Are Very Snowy Areas. Polar Bears Live In Arctic. So Don't Be Fooled When You Think That Polar Bears Eat Penguins....
Only if it's a male bear that has happened upon some bear cubs yes. Otherwise, no, polar bears do not eat each other, they'd rather eat seals, whales and walruses than another bear.