The big brown bears in North America and their white cousins used to live in two different habitats, so generally they do not share the same territory. But global warming is upsetting the scenario of the Arctic Circle: the ocean temperature rises, the ice melt and the tundra habitat expands. The result is that the two populations are more and more often in contact. And mate.
"Grolars" and "pizzlies" is the fusion of the name of the two species, indicating the growing number of individuals who have a grizzly as a father and as a mother polar-bear.
According to experts, this hybridisation process will end up penalizing the polar bears, which are fewer in number than the grizzly and have an area that is shrinking year after year. The latest estimates show a population of polar bears that oscillates between 20 and 25 thousand copies while brown bears (including grizzly) are more than 200 thousand.