Well it's nothing personal against the penguin. I'm sure they would be delighted to eat them. But Polar Bears and Penguins live on opposite ends of the earth. So they don't get a chance to mingle very often. No, the Polar Bear's best chance to eat a penguin would be at Sea World. And even that is unlikely considering Polar Bears would need a penguin's help to escape. Anyone who's ever seen Madagascar knows that. And If I know polar bears like I think I do, they would consider it bad form to eat their liberators right after they just rescued them.