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    List of animals of Yellowstone - Wikipedia

    Bison are the largest grazing mammals in Yellowstone National Park. They are obligate herbivores, a grazer of grasslands and sedges in the meadows, the foothills, and even the high-elevation, forested plateaus of Yellowstone. Bison males, called bulls, can weigh upwards of 1,800 pounds. Females (cows) average about 1,300 pounds. Both stand approximately six feet tall at the shoulder, and can move with surprising speed to defend their young o…

    Bison are the largest grazing mammals in Yellowstone National Park. They are obligate herbivores, a grazer of grasslands and sedges in the meadows, the foothills, and even the high-elevation, forested plateaus of Yellowstone. Bison males, called bulls, can weigh upwards of 1,800 pounds. Females (cows) average about 1,300 pounds. Both stand approximately six feet tall at the shoulder, and can move with surprising speed to defend their young or when approached too closely by people. Bison breed from mid-July to mid-August, and bear one calf in April and May. Some wolf predation of bison is documented in Canada and has recently been observed in Yellowstone. Bison live an average lifespan of 20–25 years in the wild.

    Yellowstone is the only place in the lower 48 states where a population of wild American bison has persisted since prehistoric times, although fewer than 50 native bison remained there in 1902. Fearing extinction, the park imported 21 bison from two privately owned herds, as foundation stock for a bison ranching project that spanned 50 years at the Lamar Buffalo Ranch in Yellowstone's Lamar Valley. Activities there included irrigation,

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    Yellowstone National Park in the northwest United States is home to a large variety of mammals, birds, fish, reptiles and amphibians, many of which migrate within the Greater Yellowstone Ecosystem. These animals are a major park attraction.

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    There are at least 50 small mammal species known to occur in Yellowstone National Park, including four common species of bats: big brown bat, little brown bat, long-legged bat, and silver-haired bat. Squirrels, rabbits, skunks, raccoons, badgers, otters, beavers, porcupines, vole, mice, and shrew species are common, but many are nocturnal and rarely seen by visitors. The Uinta ground squirrel, least chipmunk, golden-mantled ground squirrel and American red squirrel are commonly encountered.

    Weasel species, including the North American river otter are prevalent in the park. North American beaver (Castor canadensis) were almost trapped out of the park region prior to its creation. In 1998, beaver populations were making a comeback and an estimated 500 beavers were living in the park with the densest colonial in the Bechler River and Fall River region, the Yellowstone River delta above Yellowstone Lake and the lower Madison River and its tributaries.

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    Since the creation of the park in 1872, 318 species of birds have been documented within its boundaries. Although Yellowstone is not a birding mecca because of its high altitude and cold winters, it is home to a variety of interesting bird species that attract visitor attention every year. The park has a good resident population of bald eagles, trumpeter swans, common loons, ospreys, American white pelicans, and sandhill cranes. The extensive rivers, lakes and wetlands are summer homes to large numbers of waterfowl, while the forests and meadows host many different species of warblers, sparrows and other passerine birds.

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    Yellowstone is home for four species of amphibians. Glacial activity and current cool and dry conditions are likely responsible for their relatively low numbers in Yellowstone.

    Although no Yellowstone reptile or amphibian species are currently listed as threatened or endangered, several — including the boreal toad — are thought to be declining in the West. Surveys and monitoring are underway to try to determine if amphibian populations are declining in Yellowstone National Park. In 2014, a population of plains spadefoot toad was found in the park. More common species include the boreal chorus frog, columbian spotted frog, and the blotched tiger salamander.

    Cool, dry conditions limit Yellowstone's reptiles to six species and population numbers for these species are not known. Known reptile species in the park: prairie rattlesnake (Crotalus viridis viridis), bullsnake (Pituophis catenifer sayi), valley garter snake (Thamnophis sirtalis fitchi), wandering garter snake (Thamnophis elegans vagrans), rubber boa (Charina bottae), sagebrush lizard (Sceloporus graciosus graciosus).

    In 1991 park staff began cooperating with researchers from Idaho State University to sample additional park habitats for reptiles and amphibians. This led to establishment of long-term monitoring sites in the park. The relatively undisturbed nature of the park and the baseline data may prove useful in testing hypotheses concerning the apparent declines of several species of toads and frogs in the western United States. Reptile and amphibian population declines may be caused by such factors as drought, pollution, disease, predation, habitat loss and fragmentation, introduced fish and other non-native species.

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