Do you mean polar bear?
A definiton of species is that they do not interbreed. There is an example of a brown/polar bear cross.
http://news.bbc.co.uk/1/hi/sci/tech/4766217.stm
I believe brown and polar bears are closely related. Not sure how close related black and polar bears may be.
Are black bears and white bears the same species? why or why not?
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