This photo was taken near Jackson Hole, Wyoming in 2017. A grove of Aspen trees line the fields near Jackson Hole, Wyoming. The bark layer of quaking aspens carries out photosynthesis, a task usually reserved for tree leaves. In winter, when other deciduous trees are mostly dormant, quaking aspens are able to keep producing sugar for energy. Deer, moose, and elk seek shade from aspen groves in summer. These same animals consume bark, leaves, buds, and twigs of quaking aspens throughout the year. Ruffed grouse are especially dependent on quaking aspens for food and nesting habitat.