I wanted to say: there has never been a polar bear that has seen a penguin (except in zoos) - but judging by the "they're not even from here" comment, you probably knew that. ;-)
The gameplay is funny, and I wanted to avoid hurting too many penguins. But when the levels got really hard, I lost all my fish, and then I was put back all the way in level 1. That was a bit disappointing...