From to timberline are krummholz forms of whitebark pine. Other animals also depend upon the whitebark pine. Mortality is particularly heavy in Western White Pine, Sugar Pine, Limber Pine and Whitebark Pine. Alaska cedar and whitebark pine are also present. Whitebark pine is found at high elevations. Subalpine zones occur above , often featuring whitebark pine. The rust has also killed much of the whitebark pine outside of California. Vegetation in the area includes mountain hemlock, lodgepole pine, ponderosa pine, and whitebark pine. The forests are dominated by lodgepole pine, whitebark pine, subalpine fir, and Engelmann spruce. Douglas squirrels cut down and store whitebark pine cones in their middens. Whitebark pine seeds provide food for grizzly bears. Whitebark pine forest could be replaced with Douglas fir. Clark's nutcracker is the primary seed disperser for whitebark pine ("Pinus albicaulis"). This U.S. group collaborates closely with the Whitebark Pine Ecosystem Foundation of Canada. Trees in this community include Whitebark Pine and Mountain Hemlock.