Carrots are hazardous enough, but be sure never to eat a Polar Bear; or at any rate not its liver. They are able to store very large quantities of vitamin A (they have to, where they live) and that organ is seriously toxic for such as we, though the huskies may be able to handle it. There's even a musical connection; Andy Irvine wrote a song about it once. Not one of his more successful efforts, I thought, but it contained the memorable line

The soles of my feet became detached...