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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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming Bull elk spar to establish harems of females, Gibbon Meadow, Cervus canadensis, Gibbon Meadows, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Upper Geyser Basin, Yellowstone National Park, Wyoming Mule deer in tall grass, fall, autumn, Odocoileus hemionus, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming 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, Bison bison, Yellowstone National Park, Wyoming Fly fishing below Gibbon Falls. This flyfisherman hiked up the Gibbon River to reach the foot of Gibbon Falls, Yellowstone National Park, Wyoming 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, Wyoming 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, Cervus canadensis, Madison River, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming Grizzly bear, autumn, fall, brown grasses, Ursus arctos horribilis, Lamar Valley, Yellowstone National Park, Wyoming A male moose, bull moose, on snow covered field, near Cooke City, Alces alces, Yellowstone National Park, Wyoming 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, Cervus canadensis, Madison River, Yellowstone National Park, Wyoming 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, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming 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, Wyoming 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, Wyoming 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, Upper Geyser Basin, Yellowstone National Park, Wyoming Clepsydra Geyser, a geyser which is almost continually erupting. A member of the Fountain Group of geothermal features, Lower Geyser Basin, Yellowstone National Park, Wyoming Coyote in snow covered field along the Madison River, Canis latrans, Yellowstone National Park, Wyoming Yellow-bellied marmots can often be found on rocky slopes, perched atop boulders, Marmota flaviventris, Yellowstone National Park, Wyoming 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, Antilocapra americana, Yellowstone National Park, Wyoming The Lamar herd of bison grazes, a mix of mature adults and young calves, Bison bison, Lamar Valley, Yellowstone National Park, Wyoming The Lamar herd of bison grazes, a mix of mature adults and young calves, Bison bison, Lamar Valley, Yellowstone National Park, Wyoming A herd of bison grazes near the Lamar River, Bison bison, Lamar Valley, Yellowstone National Park, Wyoming 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, Cervus canadensis, Gibbon Meadows Elk in the Gibbon River, Cervus canadensis, Gibbon Meadows, Yellowstone National Park, Wyoming 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, Wyoming 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, Wyoming Crested Pool is a blue, superheated pool.  Unfortunately, it has claimed a life.  It reaches a overflowing boiling state every few minutes, then subsides a bit before building to a boil and overflow again.  Upper Geyser Basin, Yellowstone National Park, Wyoming Old Faithful geyser at sunset, at peak eruption, Upper Geyser Basin, Yellowstone National Park, Wyoming A crowd enjoys watching Old Faithful geyser at peak eruption, Upper Geyser Basin, Yellowstone National Park, Wyoming Riverside Geyser at peak eruption, arcing 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, Wyoming A visitor videotapes the eruption of Lion Geyser, with Old Faithful Inn visible in the distance.  Lion Geyser, whose eruption is preceded by a release of steam that sounds like a lion roaring, erupts just once or a few times each day, reaching heights of up to 90 feet.  Upper Geyser Basin, Yellowstone National Park, Wyoming Daisy Geyser erupting with visitors visible in the distance..  Daisy Geyser, a cone-type geyser that shoots out of the ground diagonally, is predictable with intervals ranging from 120 to over 200 minutes.  It reaches heights of 75 feet, lasts 3 to 4 minutes and rarely erupts in concert with nearby Splendid Geyser.  Upper Geyser Basin, Yellowstone National Park, Wyoming Sawmill Geyser erupting.  Sawmill Geyser is a fountain-type geyser and, in some circumstances, can be erupting about one-third of the time up to heights of 35 feet.  Upper Geyser Basin, Yellowstone National Park, Wyoming Castle Geyser erupts, reaching 60 to 90 feet in height and lasting 20 minutes.  While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin, Yellowstone National Park, Wyoming Castle Geyser erupts with the colorful bacteria mats of Tortoise Shell Spring in the foreground.  Castle Geyser reaches 60 to 90 feet in height and lasts 20 minutes.  While Castle Geyser has a 12 foot sinter cone that took 5,000 to 15,000 years to form, it is in fact situated atop geyserite terraces that themselves may have taken 200,000 years to form, making it likely the oldest active geyser in the park. Upper Geyser Basin, Yellowstone National Park, Wyoming Grand Geyser erupts (right) with a simultaneous eruption from Vent Geyser (left).  Grand Geyser is a fountain-type geyser reaching 200 feet in height and lasting up to 12 minutes.  Grand Geyser is considered the tallest predictable geyser in the world, erupting about every 12 hours.  It is often accompanied by burst or eruptions from Vent Geyser and Turban Geyser just to its left.  Upper Geyser Basin, Yellowstone National Park, Wyoming Ledge Geyser, vents releasing steam, in the Porcelain Basin area of Norris Geyser Basin, Yellowstone National Park, Wyoming White Dome Geyser rises to a height of 30 feet or more, and typically erupts with an interval of 15 to 30 minutes.  It is located along Firehole Lake Drive, Lower Geyser Basin, Yellowstone National Park, Wyoming Pink Cone Geyser erupts.  Pink Cone Geyser reaches 30 feet in height, and has highly variable interval and duration.  It is a cone-type geyser and its cone has a pinkish tint due to manganese oxide in it.  Firehole Lake Drive, Lower Geyser Basin, Yellowstone Park, Yellowstone National Park, Wyoming 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, Yellowstone National Park, Wyoming Grand Prismatic Spring displays brilliant colors along its edges, created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges.  The outer orange and red regions are the coolest water in the spring, where the overflow runs off.  Midway Geyser Basin, Yellowstone National Park, Wyoming Grand Prismatic Spring displays brilliant colors along its edges, created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges.  The outer orange and red regions are the coolest water in the spring, where the overflow runs off.  Midway Geyser Basin, Yellowstone National Park, Wyoming Steam rises above the Midway Geyser Basin, largely from Grand Prismatic Spring and Excelsior Geyser. The Firehole River flows by, Yellowstone National Park, Wyoming   more ...

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Updated: October 20, 2020