American black bears may raid squirrel caches for limber pine nuts. Engelmann spruce, subalpine fir, and limber pine. Mortality is particularly heavy in Western White Pine, Sugar Pine, Limber Pine and Whitebark Pine. Mountain pine beetles inhabit ponderosa, whitebark, lodgepole, Scots, jack pine, and limber pine trees. Higher elevations to support subalpine forests of limber pine, lodgepole pine, and Jeffrey pine. Aspen, Engelmann spruce, subalpine fir trees, and limber pine also grow here. Higher elevations contain whitebark pine, Engelmann spruce, subalpine fir, and limber pine. The highest peaks support a few white fir, limber pine, or bristlecone pine. Limber pine (Pinus flexilis) also grow in the forest. For example, "Pinus flexilis" (limber pine), has fascicles of 5 needles. Limber Pine, which can live for over 1,000 years, are also found in the area.