Via Sullivan, a new variety of bear has appeared in Canada because of climate change:
One such sign [of environmental pressure on bears] is the emergence of a new creature in the polar bear’s range, first spotted in the wild in 2006 near Sachs Harbour, Northwest Territories. It’s got a long neck like a polar bear, but it’s smaller. It lies and behaves like a polar bear, but it has shoulder humps. The new creature has hairy paw soles like a polar bear, but its hair is mostly solid, with only patches of hollow hair.
As caribou migration routes have moved North, grizzlies have followed and started mating with polar bears. Not only have they produced hybrid young, but those young are fertile. Polar bears and grizzlies only diverged about 150,000 years ago and haven’t developed many genetic differences, despite quite dramatic visual dissimilarities. Second-generation hybrids have now been confirmed in the wild.
This kind of thing isn't new, but we don't often see it with large predators. On the other hand, about 30,000 years ago, another large predator moved into a cousin species' territory as the earth warmed up, and interbred, and went on to invent blogs.