Silhouette of a tree Sunlight filters through the leaves of an umbrella tree 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 red eyed tree frog (Agalychnis callidryas) at the Sunset Zoo 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 Morning fog shrouds trees, Pacific Rim National Park Reserve, Vancouver Island, Canada Scenic view of a lake in Jasper National Park in Canada Reflection of autumn foliage in water, Canada Sunset over mountains at Big Meadows, Blue Ridge Mountains, Virginia 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 Banff Park landscape with fog and reflections, Banff National Park, Alberta, Canada A skyward view of the bare branches and autumn leaves, Russell-Brasstown scenic highway, Chattahoochee National Forest, Georgia This capuchin monkey sits perched in a tree, Madidi National Park, Bolivia An American chestnut leaf A silver maple leaf A boy walks down a hill in Banff National Park, Alberta, Canada The slow waters of wetlands stir fallen leaves creating spots of blurred yellow A view of cliffs from the Cloud Peak Skyway, Wyoming A close-up of berries during winter, Lincoln, Nebraska 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 Cirque of the Towers, Lonesome Lake, Popo Agie Wilderness, Wyoming Fall color and rock formations casting reflections in calm water. A magnificent bull elk stands amidst a snowfall in the Vermilion Lakes area, Banff National Park, Alberta, Canada Sunset over a Chesapeake Bay shoreline.; Kent Island, Maryland.