Grizzly bears are massive carnivores who weigh more than 1,800 pounds and stand nearly 9 feet tall when they rear up onto their hind legs. They are bad-tempered and territorial. A grizzly bear attacks mainly by tearing at opponents with its claws. they are normally omnivores: their diets consist of both plants and animals. They have been known to prey on large mammals, when available, such as moose, elk, caribou, and even black bears; though they are more likely to take calves and injured individuals rather than healthy adults. Grizzly bears feed on fish such as salmon, trout, and bass, and those with access to a more protein-enriched diet in coastal areas potentially grow larger than inland individuals. Grizzly bears also readily scavenge food or carrion left behind by other animals. Grizzly bears will also eat birds and their eggs, and gather in large numbers at fishing sites to feed on spawning salmon. They frequently prey on baby deer left in the grass, and occasionally they raid the nests of raptors such as bald eagles. They are found in cold forests, and are found either solitary or in pairs.