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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. Yellowstone National Park Photo. Image ID: 19693 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | Bull elk spar to establish harems of females, Gibbon Meadow. Yellowstone National Park Picture. 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. Stock Photography of Yellowstone National Park. Image ID: 13319 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA |
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| 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. Photograph of Yellowstone National Park. 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. Yellowstone National Park Photos. Image ID: 26939 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Mule deer in tall grass, fall, autumn. Yellowstone National Park Image. Image ID: 19577 Species: Mule deer, Odocoileus hemionus Location: Yellowstone National Park, Wyoming, USA |
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| 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. Professional stock photos of Yellowstone National Park. 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. Pictures of Yellowstone National Park. 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. Yellowstone National Park Photo. Image ID: 13367 Location: Upper Geyser Basin, 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. Yellowstone National Park Picture. 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. Stock Photography of Yellowstone National Park. 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. Photograph of Yellowstone National Park. Image ID: 19721 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA |
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| Grizzly bear, autumn, fall, brown grasses. Yellowstone National Park Photos. 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. Yellowstone National Park Image. Image ID: 19680 Species: Moose, Alces alces Location: 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. Professional stock photos of Yellowstone National Park. Image ID: 19700 Species: Elk, Cervus canadensis Location: Madison River, Yellowstone National Park, Wyoming, USA |
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| 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. Pictures of Yellowstone National Park. Image ID: 19718 Species: Elk, Cervus canadensis Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA | The Lower Falls of the Yellowstone River drops 308 feet at the head of the Grand Canyon of the Yellowstone. A long exposure blurs the fast-flowing water. The canyon is approximately 10,000 years old, 20 miles long, 1000 ft deep, and 2500 ft wide. Its yellow, orange and red-colored walls are due to oxidation of the various iron compounds in the soil, and to a lesser degree, sulfur content. Yellowstone National Park Photo. Image ID: 13338 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA | Snow covers the rocks and cliffs around Lower Yellowstone Falls in winter. 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. Yellowstone National Park Picture. Image ID: 19572 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA |
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| Old Faithful geyser. 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. Stock Photography of Yellowstone National Park. Image ID: 26945 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA | Clepsydra Geyser, a geyser which is almost continually erupting. A member of the Fountain Group of geothermal features Photograph of Yellowstone National Park. Image ID: 26947 Location: Lower Geyser Basin, Yellowstone National Park, Wyoming, USA | Coyote in snow covered field along the Madison River. Yellowstone National Park Photos. Image ID: 19635 Species: Coyote, Canis latrans Location: Yellowstone National Park, Wyoming, USA |
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| Yellow-bellied marmots can often be found on rocky slopes, perched atop boulders. Yellowstone National Park Image. Image ID: 13055 Species: Yellow-bellied marmot, Marmota flaviventris Location: Yellowstone National Park, Wyoming, USA | Pronghorn antelope, Lamar Valley. The Pronghorn is the fastest North American land animal, capable of reaching speeds of up to 60 miles per hour. The pronghorns speed is its main defense against predators. Professional stock photos of Yellowstone National Park. Image ID: 13080 Species: Pronghorn antelope, Antilocapra americana Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | The Lamar herd of bison grazes, a mix of mature adults and young calves. Pictures of Yellowstone National Park. Image ID: 13123 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA |
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| The Lamar herd of bison grazes, a mix of mature adults and young calves. Yellowstone National Park Photo. Image ID: 13132 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | A herd of bison grazes near the Lamar River. Yellowstone National Park Picture. Image ID: 13145 Species: American bison, Bison bison Location: Lamar Valley, Yellowstone National Park, Wyoming, USA | Bull elk, antlers bearing velvet, Gibbon Meadow. Elk are the most abundant large mammal found in Yellowstone National Park. More than 30,000 elk from 8 different herds summer in Yellowstone and approximately 15,000 to 22,000 winter in the park. Bulls grow antlers annually from the time they are nearly one year old. When mature, a bulls rack may have 6 to 8 points or tines on each side and weigh more than 30 pounds. The antlers are shed in March or April and begin regrowing in May, when the bony growth is nourished by blood vessels and covered by furry-looking velvet. Stock Photography of Yellowstone National Park. Image ID: 13154 Species: Elk, Cervus canadensis Location: Gibbon Meadows, Yellowstone National Park, Wyoming, USA |
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| Elk in the Gibbon River. Photograph of Yellowstone National Park. Image ID: 13155 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 the famous and popular Artist Point on the south side of the Grand Canyon of the Yellowstone. When conditions are perfect in midsummer, a morning rainbow briefly appears in the falls. Yellowstone National Park Photos. Image ID: 13329 Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming, USA | Morning Glory Pool has long been considered a must-see site in Yellowstone. At one time a road brought visitors to its brink. Over the years they threw coins, bottles and trash in the pool, reducing its flow and causing the red and orange bacteria to creep in from its edge, replacing the blue bacteria that thrive in the hotter water at the center of the pool. The pool is now accessed only by a foot path. Upper Geyser Basin. Yellowstone National Park Image. Image ID: 13352 Location: Upper Geyser Basin, Yellowstone National Park, Wyoming, USA |
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