This is interesting. A hunter shot a bear which turned out to be the offspring of a pairing between a Grizzly and a Polar bear.
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Definition of species: “A species is a group of organisms that can interbreed in nature to produce a fertile offspring. Stated in another way, species are reproductively isolated groups of populations. Organisms classified in the same species have very similar gene pools.”
So I guess Polar and Grizzly bears are really just different breeds of bears!?
So taxonomically bears are classified as follows and the grizzly and polar bears are 2 different species:
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Ursidae
Genus: Ursus
Species: Arctos (grizlly)
Species: Maritimus (polar)
From what I found on the web (so take with the appropriate amount of salt) phylogentic evidence indicates that the grizzly bear and polar bear diverged from a common ancestor in the Pleistocene epoch (2 million years ago). Only overlap of these 2 species today is western Canadian Arctic. Crosses between the two species produce fertile hybrids.