Two bighorn sheep rams head butting, Clear Creek County, Colorado Acacia tree silhouetted at dawn, Masai Mara Game Reserve, Kenya, East Africa, Africa Male common waterbuck, Greater Limpopo Transfrontier Park, Africa Baobab at sunrise, Ruaha National Park, Tanzania Coyote Buttes, Vermillion Cliffs National Monument, Arizona Snow Leopard in the snow, in captivity, near Bozeman, Montana Formations in Valley of the Gods with two hot air balloons, near Mexican Hat, Utah Captive whitetail deer fawn among oxeye daisies, Sandstone, Minnesota Orange clouds at sunset, Uinta National Forest, Utah Pallid bat (Antrozous pallidus) in flight, near Portal, Arizona Fireweed, Glacier National Park, Montana Mount McKinley (Mount Denali), Denali Highway, Alaska Whitetail Deer buck in velvet, Devil's Tower National Monument, Wyoming Wilson Peak at dawn in the fall, Uncompahgre National Forest, Colorado, USA Two Bison Bulls Sparring, Yellowstone National Park, Wyoming Nile crocodile swimming, Serengeti National Park, Tanzania, East Africa Gray wolf in captivity, Sandstone, Minnesota, USA Cape buffalo or African buffalo Masai Mara National Reserve, Kenya Yucca growing in rippled sand, White Sands National Monument, New Mexico Bosque del Apache National Wildlife Refuge, New Mexico Bobcat in snow, near Bozeman, Montana Cheetah, Masai Mara National Reserve, Kenya, East Africa, Africa Silverback mountain gorilla of the Kwitonda group, Volcanoes National Park, Rwanda Common raven, Petrified Forest National Park, Arizona Gray wolf adult and pups, in captivity, Sandstone, Minnesota Opossum mother and babies, in captivity, Sandstone, Minnesota Dung beetle rolling a dung ball, Kruger National Park, South Africa, Africa Joshua tree at sunset, Joshua Tree National Park, California Peter Lougheed Provincial Park, Kananaskis Country, Alberta, Canada Canadian Lynx in snow in captivity, near Bozeman, Montana Quiver tree at dawn, Namakwa, Namaqualand, South Africa Two gemsbok fighting, Kgalagadi Transfrontier Park, South Africa Maroon Bells and Crater Lake, Gunnison National Forest, Colorado Sunrise in the badlands, Theodore Roosevelt National Park, North Dakota Craggy mountains with clouds and snow cover, Jasper National Park, Alberta, Canada Captive gray wolf in the snow, near Bozeman, Montana St. Mary Lake and Wild Goose Island on a cloudy morning, Glacier National Park, Montana Mount McKinley (Mount Denali), Denali National Park and Preserve, Alaska Two bull elk in the snow, National Elk Refuge, Jackson, Wyoming Yellow aspen leaves in the fall, Uncompahgre National Forest, Colorado, USA Fence posts in salt grass, Hope, Alaska Black bear, outside Glacier National Park, Montana Bison in snow, Yellowstone National Park, Wyoming Two young wild burro playing, Custer State Park, South Dakota, USA Aspen trunks among yellow leaves, Colorado, USA Sneffels Range with fall colors, Uncompahgre National Forest, Colorado Clouds at sunset reflected in an unnamed lake, Shoshone National Forest, Wyoming Bison reflected in a pond, Yellowstone National Park, Wyoming Page 1 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10