The western Rocky Mountain Division, informally called the Rocky Mountain Front, consists of a dense coniferous forest and has numerous species of spruce, fir, and pine. The Jefferson Division is dominated by ponderosa and lodgepole pine which prefer a drier climate. The grizzly bear and timber wolf are found in the western sections of the forest, and are especially dense in the designated wilderness areas. In addition, the western section contains much of the wildlife present at the time of the Lewis and Clark Expedition through the region. Mountain goats, bighorn sheep, elk, cougars, Canadian lynxes, wolverines and black bears are most common nearest the Continental Divide. In other sections of the forest, black bears, mule deer and white-tailed deer are the largest mammals found. Coyotes, raccoons, beavers, minks, muskrats, river otters and Columbian white-tailed deer inhabit the up-stream inlands. Throughout the forest, bald eagles, grouse, peregrine falcon and red tailed hawks are increasing in numbers. Lakes and streams are more numerous in the western section due to a higher altitude and more precipitation, and are home to the native westslope cutthroat trout. In the of rivers and streams in the forest, rainbow trout, brook trout and northern pike are relatively common. Excellent fly fishing opportunities are plentiful, especially in the Smith River.