An interesting impact of northward migration! Polar bears and grizzly bears are a close enough match of DNA to mate but under normal circumstances they would never interact in the wild. However, the first hybrid has been found in the wild - and the most likely cause of this is climate driven as grizzly bears move northwards!
References:
http://news.nationalgeographic.com/news/2006/05/polar-bears_2.html
There is also an academic, and quite heated literature on this topic. For example, some scientists do not believe that the polar bear is a different species from the brown bear...
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