Black bears are a separate bear species
Polar bears are a separate bear species but close to browns & hybrids:
-hybrids between polars mating with browns
Brown bears are a separate species encompasing the following:
-hybrids when Browns mate with Polars (theres some confusion here)
here's an analogy for brown bears: A quarterback is a football player. A runningback is a football player. Both are football players. A Kodiak is a brown bear. A Grizzly is a brown bear. Both are brown bears. A black bear is a referee.