DNA tests show that it was, indeed, a polar bear/grizzly hybrid that was shot in Canada, as I posted two days ago. I only hope that the bear managed to have some cubs before its shooting. I'm afraid that, without some hybridization leading to changes in mating and hunting behavior, the polar bear might go completely extinct in the years to come. There are already indications that the melting polar ice is really hitting them hard. *sigh*
Still no consensus as to what to call the hybrid, but the proposed Linnaean classification, Ursus maritimus horribilis, sounds cool. Very butch.