Front claws are 2-4 inches long, slightly curved, and good for digging. Claw marks are usually visible in tracks. Behavior Usually more aggressive than black bears. Females will aggressively protect cubs. Mostly active during dusk and dawn, although grizzly bears can be active any time of day.
Strength is exceptional.
They routinely roll huge rocks and logs looking for food. More than 50,000 grizzlies once ranged from the Mississippi River to the Pacific Ocean and from Canada to central Mexico, occupying plains, forests, mountains, beaches, and wetlands. In the lower 48, grizzly bears currently inhabit Montana, Wyoming, Idaho, and Washington. In 1975 the grizzly was listed as threatened and received protection under the Endangered Species Act of 1973. Size is not a reliable indicator of species .