Polar bear-grizzly hybrids are extremely rare, though one was found (that is, shot) last year.
Now a second generation bear might have been discovered (shot by a native hunter). Story in the National Post.
A second generation grizzly-polar bear?
May 9, 2010 — Ralph Maughan4 Responses to “A second generation grizzly-polar bear?”
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The Wildlife News 
May 10, 2010 at 8:03 PM
Is there any record of black bears breeding with grizzlies?
May 10, 2010 at 9:23 PM
Jeff,
No, they are not genetically compatible.
May 11, 2010 at 10:33 AM
Polar bears are actually an off shoot of the Brown bear and their hybridization, if you want to call it that, is all in the family.
May 11, 2010 at 5:55 PM
With all of these extinctions, we need some hybridization to give the taxonomists something to do! 😉