Silhouette of a tree Sunlight filters through the leaves of an umbrella tree Quaking Aspen and Ponderosa Pine trees display fall colors. A tree frog on a leaf, Madidi National Park, Bolivia A green tree python at the Riverside Zoo The eye and face of a Whites tree frog, Pelodryas caerulea Misty view of a gray wolf sitting near a tree, Yellowstone National Park, Wyoming A clump of grasses is framed by reflections of sky and trees in the lake, Bighorn National Forest, Wyoming A red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo A red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo A red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo Morning fog shrouds trees, Pacific Rim National Park Reserve, Vancouver Island, Canada This capuchin monkey sits perched in a tree, Madidi National Park, Bolivia Reflection of autumn foliage in water, Canada Scenic view of a lake in Jasper National Park in Canada Sunset over mountains at Big Meadows, Blue Ridge Mountains, Virginia Autumn foliage, Cape Breton Highlands National Park, Nova Scotia, Canada Fishermen in the morning mist on the Madison River, Yellowstone National Park, Wyoming A view of Death Lake and the surrounding forests and cliffs, Northwest Territories, Canada Old Faithful geyser erupting in winter, Yellowstone National Park, Wyoming Banff Park landscape with fog and reflections, Banff National Park, Alberta, Canada View of Moraine Lake with low-lying clouds at one end, Alberta, Canada A skyward view of the bare branches and autumn leaves, Russell-Brasstown scenic highway, Chattahoochee National Forest, Georgia A white oak leaf An American chestnut leaf A silver maple leaf The slow waters of wetlands stir fallen leaves creating spots of blurred yellow A close-up of berries during winter, Lincoln, Nebraska A view of cliffs from the Cloud Peak Skyway, Wyoming A boy walks down a hill in Banff National Park, Alberta, Canada Japanese maple leaves, Acer palmatum, in the fall.; New York. Waterfall in between fall colors in a forest Virginia Creek, with a cross-country skier, Yellowstone National Park, Montana Fresh snow at the South Rim, Grand Canyon National Park, Arizona Maligne Lake, which is the largest and deepest lake in Alberta's Jasper National Park, Canada A clearing storm at dawn over Saint Mary Lake The yellow leaves of fall frame a rock formation. Cirque of the Towers, Lonesome Lake, Popo Agie Wilderness, Wyoming A magnificent bull elk stands amidst a snowfall in the Vermilion Lakes area, Banff National Park, Alberta, Canada Fall color and rock formations casting reflections in calm water. Sunset over a Chesapeake Bay shoreline.; Kent Island, Maryland.