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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 | 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 | 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 |
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| 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 | 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 |
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| Mule deer in tall grass, fall, autumn. Image ID: 19577 Species: Mule deer, Odocoileus hemionus Location: Yellowstone National Park, Wyoming, 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 | 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 |
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| 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 | 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 |
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| 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 Location: La Jolla, California, USA | Grizzly bear, autumn, fall, brown grasses. Image ID: 19614 Species: Grizzly bear, Ursus arctos horribilis Location: Lamar Valley, Yellowstone National Park, Wyoming, USA |
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| 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 | North Pacific Yellowtail brushing against blue shark. Image ID: 01000 Species: North Pacific Yellowtail, Seriola lalandi, Prionace glauca Location: San Diego, California, USA | 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: 22527 Species: Brown pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA |
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| California brown pelican, showing characteristic winter plumage including red/olive throat, brown hindneck, yellow and white head colors. Image ID: 26462 Species: Brown pelican, Pelecanus occidentalis californicus Location: La Jolla, California, USA | Brown pelican portrait, displaying winter breeding plumage with distinctive dark brown nape, yellow head feathers and red gular throat pouch. Image ID: 22529 Species: Brown pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA | Bald eagle, closeup of head and shoulders showing distinctive white head feathers, yellow beak and brown body and wings. Image ID: 22595 Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis Location: Kachemak Bay, Homer, Alaska, USA |
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| Brown pelican portrait, displaying winter plumage with distinctive yellow head feathers and red gular throat pouch. Image ID: 28329 Location: La Jolla, California, USA | Portrait of California brown pelican, with the characteristic winter mating plumage shown: red throat, yellow head and dark brown hindneck. Image ID: 23647 Species: Brown pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA | California brown pelican, showing characteristic winter plumage including red/olive throat, brown hindneck, yellow and white head colors. Image ID: 26463 Species: Brown pelican, Pelecanus occidentalis californicus Location: La Jolla, California, USA |
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| Brown pelican portrait, displaying winter breeding plumage with distinctive dark brown nape, yellow head feathers and red gular throat pouch. Image ID: 22565 Species: Brown pelican, Pelecanus occidentalis Location: La Jolla, California, USA | Yellow cottonwood trees in autumn, fall colors in the Virgin River Narrows in Zion National Park. Image ID: 26090 Location: Virgin River Narrows, Zion National Park, Utah, USA | Brown pelican. This large seabird has a wingspan over 7 feet wide. The California race of the brown pelican holds endangered species status, due largely to predation in the early 1900s and to decades of poor reproduction caused by DDT poisoning. In winter months, breeding adults assume a dramatic plumage with brown neck, yellow and white head and bright red gular throat pouch. Image ID: 15123 Species: Brown pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, 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: 19700 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA | Bull elk in sage brush with large rack of antlers during the fall rut (mating season). This bull elk has sparred with other bulls to establish his harem of females with which he hopes to mate. Image ID: 19718 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Brown pelican closeup showing characteristic winter mating plumage, including yellow head, dark brown nape of neck and red gular throat pouch. Image ID: 20154 Species: Brown pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus Location: La Jolla, California, USA |
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