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 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 Morning fog shrouds trees, Pacific Rim National Park Reserve, Vancouver Island, Canada 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 Fishermen in the morning mist on the Madison River, Yellowstone National Park, Wyoming Banff Park landscape with fog and reflections, Banff National Park, Alberta, Canada A view of Death Lake and the surrounding forests and cliffs, Northwest Territories, 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 The slow waters of wetlands stir fallen leaves creating spots of blurred yellow A boy walks down a hill in Banff National Park, Alberta, Canada A view of cliffs from the Cloud Peak Skyway, Wyoming Virginia Creek, with a cross-country skier, Yellowstone National Park, Montana Waterfall in between fall colors in a forest A close-up of berries during winter, Lincoln, Nebraska Maligne Lake, which is the largest and deepest lake in Alberta's Jasper National Park, Canada Fresh snow at the South Rim, Grand Canyon National Park, Arizona A clearing storm at dawn over Saint Mary Lake 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.