I have done a lot of reading about bears. Hope to hunt big griz sometime but until/if that happens I'll live in the fantasy world of the written word. From what I have read, and been told, yes, griz and brown bears are the same genetically. Coastal griz are much bigger than inland browns. I have also read that an angered, but much smaller, black bear can be a formidable opponenent against a griz. Eyewitness reports are the blackie can grasp onto the chest of the griz and with hind claws rip him open. Otherwise blackies are reclusive and fearsome only when cornered or cubs are endangered. Griz on the other hand can be unpredicatable and often attack humans for no apparent reason. I have a couple good books my son sent to me from Alaska about grizzly, really 'grizzly' encounters. One is documented modern times. The other is oral history from years in the past. Rather read about than experience some of it. :shocked2: