The grizzly bear is the second largest land carnivore in North America. It has a strong, heavy body with an average length of 1.8 metres from nose to tail. It is distinguished from other bears by the large shoulder hump that supports its massive front legs, its extremely long front claws and the concave facial profile of its large head. Contrary to popular belief, the grizzly bear is not a true hibernator. In the winter its body temperature may drop a few degrees and its respiration may slow slightly, but it can remain active all winter.