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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19693 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Sunrise glints yellow on breaking wave, dawn surf. Image ID: 27977 Location: The Wedge, Newport Beach, California, USA | Bald eagle, closeup of head and shoulders showing distinctive white head feathers, yellow beak and brown body and wings. Image ID: 22582 Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis Location: Kachemak Bay, Homer, Alaska, USA |
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| Bull elk spar to establish harems of females, Gibbon Meadow. Image ID: 13151 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA | A rainbow appears in the mist of the Lower Falls of the Yellowstone River. At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park. This view is from Lookout Point on the North side of the Grand Canyon of the Yellowstone. When conditions are perfect in midsummer, a midmorning rainbow briefly appears in the falls. Image ID: 13319 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA | Grand Prismatic Spring (left) and Excelsior Geyser (right). Grand Prismatic Spring displays a stunning rainbow of colors created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The blue water in the center is too hot to support any bacterial life, while the outer orange rings are the coolest water. Grand Prismatic Spring is the largest spring in the United States and the third-largest in the world. Midway Geyser Basin. Image ID: 13571 Location: Midway Geyser Basin, Yellowstone National Park, Wyoming, USA |
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| Old Faithful geyser, sunrise. Reaching up to 185' in height and lasting up to 5 minutes, Old Faithful geyser is the most famous geyser in the world and the first geyser in Yellowstone to be named. Image ID: 26939 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Mule deer in tall grass, fall, autumn. Image ID: 19577 Species: Mule deer, Odocoileus hemionus Location: Yellowstone National Park, Wyoming, USA | California Brown Pelican head throw, stretching its throat to keep it flexible and healthy. Note the winter mating plumage, olive and red throat, yellow head. Image ID: 30336 Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA |
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| Spectacular display of pristine cabbage coral, Turbinaria reniformis, in Nigali Pass on Gao Island, Fiji. Image ID: 34714 Species: Cabbage Coral, Turbinaria reniformis Location: Nigali Passage, Gau Island, Lomaiviti Archipelago, Fiji | Spectacular display of pristine cabbage coral, Turbinaria reniformis, in Nigali Pass on Gao Island, Fiji. Image ID: 31314 Species: Cabbage Coral, Tubinaria reniformis, Turbinaria reniformis, Cabbage Coral Location: Nigali Passage, Gau Island, Lomaiviti Archipelago, Fiji | Lower Falls of the Yellowstone River. At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park. This view is from the famous and popular Artist Point on the south side of the Grand Canyon of the Yellowstone. Image ID: 07769 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA |
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| Lower Falls of the Yellowstone River. At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park. This view is from the famous and popular Artist Point on the south side of the Grand Canyon of the Yellowstone. Image ID: 07770 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA | Lower Falls of the Yellowstone River. At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park. This view is from the famous and popular Artist Point on the south side of the Grand Canyon of the Yellowstone. Image ID: 07771 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA | Yellow sulphur sponge and white metridium anemones, on a cold water reef teeming with invertebrate life. Browning Pass, Vancouver Island. Image ID: 35280 Species: Plumose Anemone, Bread crumb sponge, Metridium senile, Halichondria panicea Location: British Columbia, Canada |
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| Bright red Plexauridae sea fan gorgonian and yellow sarcophyton leather coral on pristine coral reef, Fiji. Image ID: 31325 Species: Sarcophyton Soft Coral, Gorgonian, Sea Fan, Sarcophyton, Gorgonacea, Plexauridae Location: Vatu I Ra Passage, Bligh Waters, Viti Levu Island, Fiji | Spectacular display of pristine cabbage coral, Turbinaria reniformis, in Nigali Pass on Gao Island, Fiji. Image ID: 31336 Species: Cabbage Coral, Tubinaria reniformis, Turbinaria reniformis, Cabbage Coral Location: Nigali Passage, Gau Island, Lomaiviti Archipelago, Fiji | Brown pelican preening, cleaning its feathers after foraging on the ocean, with distinctive winter breeding plumage with distinctive dark brown nape, yellow head feathers and red gular throat pouch. Image ID: 36681 Species: Brown Pelican, Pelecanus occidentalis californicus, Pelecanus occidentalis Location: La Jolla, California, USA |
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| A brown pelican preening, uropygial gland (preen gland) visible near the base of its tail. Preen oil from the uropygial gland is spread by the pelican's beak and back of its head to all other feathers on the pelican, helping to keep them water resistant and dry. Note adult winter breeding plumage in display, with brown neck, red gular throat pouch and yellow and white head. Image ID: 36682 Species: Brown Pelican, Pelecanus occidentalis californicus, Pelecanus occidentalis Location: La Jolla, California, USA | Brown pelican portrait, displaying winter plumage with distinctive yellow head feathers and red gular throat pouch. Image ID: 30255 Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA | The bisons massive head is its most characteristic feature. Its forehead bulges because of its convex-shaped frontal bone. Its shoulder hump, dwindling bowlike to the haunches, is supported by unusually long spinal vertebrae. Over powerful neck and shoulder muscles grows a great shaggy coat of curly brown fur, and over the head, like an immense hood, grows a shock of black hair. Its forequarters are higher and much heavier than its haunches. A mature bull stands about 6 1/2 feet (2 meters) at the shoulder and weighs more than 2,000 pounds (900 kilograms). The bisons horns are short and black. In the male they are thick at the base and taper abruptly to sharp points as they curve outward and upward; the females horns are more slender. Image ID: 13120 Species: American bison, Bison bison Location: Yellowstone National Park, Wyoming, USA |
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| Fly fishing below Gibbon Falls. This flyfisherman hiked up the Gibbon River to reach the foot of Gibbon Falls. Image ID: 13269 Location: Gibbon River, Yellowstone National Park, Wyoming, USA | A rainbow appears in the spray of Riverside Geyser as it erupts over the Firehole River. Riverside is a very predictable geyser. Its eruptions last 30 minutes, reach heights of 75 feet and are usually spaced about 6 hours apart. Upper Geyser Basin. Image ID: 13367 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19697 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA |
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| Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females. Image ID: 19698 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Elk, bull elk, adult male elk with large set of antlers. By September, this bull elk's antlers have reached their full size and the velvet has fallen off. This bull elk has sparred with other bulls for access to herds of females in estrous and ready to mate. Image ID: 19721 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Brown pelican portrait, displaying winter plumage with distinctive yellow head feathers and red gular throat pouch. Image ID: 28332 Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA |
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| Grizzly bear, autumn, fall, brown grasses. Image ID: 19614 Species: Grizzly bear, Ursus arctos horribilis Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | A male moose, bull moose, on snow covered field, near Cooke City. Image ID: 19680 Species: Moose, Alces alces Location: Yellowstone National Park, Wyoming, USA | Blue shark and yellowtail in the open ocean. Image ID: 01000 Species: North Pacific Yellowtail, Seriola lalandi, Prionace glauca Location: San Diego, California, USA |
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