Black bears have a relatively straight profile from the forehead to the tip of the nose. Grizzly bears have smaller, more rounded ears. The ears of the black bear are larger, more erect and more pointed. Black bears usually do not have distinctive shoulder humps. Grizzly bears have long, slightly curved, more obvious claws.
Black bears have shorter, more curved claws.
In grizzlies, all the toe prints will be above the line. In black bears, half to all of the fifth toe will be below the line. If it s a grizzly bear, call immediately. If you are certain the bear is a black bear, encourage it to leave. Bang on pots and pans or make other loud noises.