So… Wally’s vegetarian resolve is not entirely impenetrable. Polar bears can go to desperate measures when they get hungry enough.
I’ve seen this nature show called Polar Bear Battlefield. It goes into the survival of polar bears. There is this part in the summer, when the polar bears are hungry and their icy hunting grounds are melted. Normally they are loners and would not hunt together other than as a cub with their mom, but they all come together on this island of a ton of walruses (actually several tons), not the first choice in the polar bear’s diet, especially with those dangerous tusks. Needless to say it was a huge bloody battle and in the end the bears did not go hungry.
Also, walruses, like polar bears, only live in the Arctic and not the Antarctic.