Males weigh on average 230 – 450 kg (500 - 1000 lb). Newborn bears may weigh less than 500 grams. Although variable from blond to nearly black, grizzly bear fur is typically brown in color with white tips.[3] A pronounced muscular hump occurs on their shoulders which strengthens their front limbs for digging and running; they can attain speeds of 55 km/hr (35 mph). The hump is also a good way to determine a black bear from a brown bear, as black bears do not have this hump.