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のハイブリッドが初めて野生で確認されたそうだ
(リンク先には(;´Д`)かわいそうな映像が含まれています。)
http://news.bbc.co.uk/2/hi/science/nature/4766217.stm

"However, there are behavioural differences between the species, including timing of mating seasons, that make such hybrids highly unusual and it is unlikely that any resultant offspring would be viable."

Canadian wildlife officials are now thinking up a name for the creature. Some of the suggestions they have come up with so far are "pizzly", "grolar bear" or "nanulak", after the Inuit names for polar bear (nanuk) and grizzly bear (aklak).

地球の温暖化によりグリスリーとしろくまの生活域が近接、混合することによるハイブリッドの出現なのだろうか