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Juvenile elk in golden, late afternoon light, in meadow along Madison River, autumn, Cervus canadensis, 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, Yellowstone National Park, Wyoming Male elk (bull) alongside female elk in grassy meadow, during rutting season.  A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, Yellowstone National Park, Wyoming Bull elk, with large antlers, alongside female elk during rutting season, autumn.  A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, 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 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, with large antlers, alongside female elk during rutting season, autumn.  A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, 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 Excelsior Geyser, now dormant, was formerly the worlds largest geyser. It still produces immense runoff into the Firehole River: 4,500 gallons per minute, or 6 million gallons per day. It is located in Midway Geyser Basin, Yellowstone National Park, Wyoming Wildflowers on Mount Washburn, on the north side of Dunraven Pass near Tower Junction, Helianthella uniflora, Yellowstone National Park, Wyoming Madison River steaming in the cold air, sunrise, autumn, tall grasses and golden light, Yellowstone National Park, Wyoming Bacteria mats and Grand Prismatic Spring.  The orange color is due to bacteria which thrive only on the cooler fringes of the hot spring, while the hotter center of the spring hosts blue-colored bacteria, Midway Geyser Basin, 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 Bacteria mats and Grand Prismatic Spring.  The orange color is due to bacteria which thrive only on the cooler fringes of the hot spring, while the hotter center of the spring hosts blue-colored bacteria, Midway Geyser Basin, Yellowstone National Park, Wyoming Panorama of Excelsior Geyser, now dormant, was formerly the worlds largest geyser. It still produces immense runoff into the Firehole River: 4,500 gallons per minute, or 6 million gallons per day. It is located in Midway Geyser Basin, Yellowstone National Park, Wyoming Bacteria mats and Grand Prismatic Spring.  The orange color is due to bacteria which thrive only on the cooler fringes of the hot spring, while the hotter center of the spring hosts blue-colored bacteria, Midway Geyser Basin, Yellowstone National Park, Wyoming Tourists get a good look at wild elk who have become habituated to human presence in Yellowstone National Park, Cervus canadensis Tourists get a good look at wild elk who have become habituated to human presence in Yellowstone National Park, Cervus canadensis Coyote crosses a road in front of a car.  Dozens of coyotes, wolves, bears, elk and bison are killed each year in Yellowstone as they attempt to cross the roads in front of drivers who are not paying attention or speeding, Canis latrans, 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 Bull elk, with large antlers, alongside female elk during rutting season, autumn.  A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, 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 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 Juvenile elk, autumn, Cervus canadensis, 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, 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, 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 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 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, 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, 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 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 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, Yellowstone National Park, Wyoming Large male elk (bull) in snow covered meadow near Madison River.  Only male elk have antlers, which start growing in the spring and are shed each winter. The largest antlers may be 4 feet long and weigh up to 40 pounds. Antlers are made of bone which can grow up to one inch per day. While growing, the antlers are covered with and protected by a soft layer of highly vascularised skin known as velvet. The velvet is shed in the summer when the antlers have fully developed. Bull elk may have six or more tines on each antler, however the number of tines has little to do with the age or maturity of a particular animal, Cervus canadensis, 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 Small group of female and juvenile elk, Cervus canadensis, Mammoth Hot Springs, Yellowstone National Park, Wyoming Large male elk (bull) in snow covered meadow near Madison River.  Only male elk have antlers, which start growing in the spring and are shed each winter. The largest antlers may be 4 feet long and weigh up to 40 pounds. Antlers are made of bone which can grow up to one inch per day. While growing, the antlers are covered with and protected by a soft layer of highly vascularised skin known as velvet. The velvet is shed in the summer when the antlers have fully developed. Bull elk may have six or more tines on each antler, however the number of tines has little to do with the age or maturity of a particular animal, Cervus canadensis, 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, 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 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 Wildflowers on Mount Washburn, on the north side of Dunraven Pass near Tower Junction, Helianthella uniflora, Yellowstone National Park, Wyoming Steam rises at sunrise in Norris Geyser Basin.  Located at the intersection of three tectonic faults, Norris Geyser Basin is the hottest and most active geothermal area in Yellowstone National Park Steam rises at sunrise in Norris Geyser Basin.  Located at the intersection of three tectonic faults, Norris Geyser Basin is the hottest and most active geothermal area in Yellowstone National Park Gibbon River meanders through Gibbon Meadows, sunrise and clouds reflected in the calm waters, Yellowstone National Park, Wyoming Great Fountain geyser.  Great Fountain geyser's large vent (16 feet across) sits amid wide sinter terraces that act as reflecting pools as the geyser slows fills prior to its eruption, Lower Geyser Basin, Yellowstone National Park, Wyoming Wildflowers on Mount Washburn, on the north side of Dunraven Pass near Tower Junction, Helianthella uniflora, Yellowstone National Park, Wyoming Steam rises at sunrise in Norris Geyser Basin.  Located at the intersection of three tectonic faults, Norris Geyser Basin is the hottest and most active geothermal area in Yellowstone National Park Steam rises at sunrise in Norris Geyser Basin.  Located at the intersection of three tectonic faults, Norris Geyser Basin is the hottest and most active geothermal area in Yellowstone National Park

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Updated: December 9, 2021

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