what is the difference between a brown and grizzly bear?
Grizzly bears and brown bears are the same species (Ursus arctos), but grizzly bears are currently considered to be a separate subspecies (U. a. ... Large male brown bears in Katmai can routinely weigh over 1000 pounds (454 kg) in the fall. In contrast, grizzly bears in Yellowstone National Park weigh far less on average.