There is genetic evidence of grizzlies acquiring polar genes over the eons likely due to glacial advances and retreats altering habitats and cutting-off populat

There is genetic evidence of grizzlies acquiring polar genes over the eons likely due to glacial advances and retreats altering habitats and cutting-off populations temporarily. https://en.wikipedia.org/wiki/Grizzly–polar_bear_hybrid#Ancient_hybridization https://en.wikipedia.org/wiki/Grizzly–polar_bear_hybrid#Anci...