Jeff Foott / Painted Hills, John Day Fossil Beds National Monument, Oregon

Jeff Foott / Painted Hills, John Day Fossil Beds National Monument, Oregon

Jeff Foott / Wahweap Hoodoos, Grand Staircase-Escalante National Monument, Utah

Daniel J. Cox / Pine (Pinus sp) tree in winter, Hayden Valley, Yellowstone National Park, Wyoming

Tim Fitzharris / Quaking Aspen (Populus tremuloides) and Ponderosa Pine (Pinus ponderosa) trees in winter, Santa Fe National Forest, New Mexico

Tim Fitzharris / Quaking Aspen (Populus tremuloides) and Ponderosa Pine (Pinus ponderosa) trees in winter, Santa Fe National Forest, New Mexico

Jim Brandenburg / Swallowtail (Papilionidae) butterfly on peeling bark, Minnesota

Jim Brandenburg / Cliff reflected in lake, Minnesota

Jim Brandenburg / Reflection in waterfall, Minnesota

Jim Brandenburg / Lake Superior, Minnesota

Jim Brandenburg / Willow (Salix sp) branches,early spring, Minnesota

Jim Brandenburg / Dry grass blowing in wind, Minnesota