There has been much written about global warming endangering Ursus maritimus, aka polar bears. As the sea ice retreats their ability to hunt basking seals - their main food diminishes.
On the other hand, recent findings from Svalbard suggest at least some the local big white carnivores are fatter than ever. This is triggering speculation about how this can happen. Hat tip to RealClearScience for the link.
It is also well known that Ursus maritimus and Ursus arctos (brown or grizzly bears) are closely related. They can and do interbreed and the offspring are, I believe, fertile.
Brown bears are well known omnivores, I’ve watched them sit in a patch of flowers happily eating the blossoms, but they’ll also kill and eat moose, reindeer, hibernating ground rodents, and spawning salmon.
If brown bears are omnivores, might not polar bears diversify their diet to include birds, eggs, and land animals too? I think they might, and some evidence suggests they do. I believe they’ve been known to raid the garbage dump at Churchill, Manitoba.
Alas, there are no panserbjørne, hat tip to Philip Pullman for their charming portrait.