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Weasels feed on small mammals and have from time to time been considered vermin because some species took poultry from farms or rabbits from commercial warrens. They do, on the other hand, eat large numbers of rodents. Their range spans Europe, North America, much of Asia and South America, and small areas in North Africa.
Wild Animals of Yellowstone National Park. Yellowstone Library and Museum Association, Yellowstone National Park, National Park Service. Streubel, Donald P. (1995). Small Mammals of the Yellowstone Ecosystem. Boulder, CO: Robert Rineharts. ISBN 0-911797-59-9.
Stone walls, built largely in the 19th century, provide more welcoming homes to certain species; and mammals from Europe, including the house mouse and Norway rat, and from elsewhere (such as the coyote) can create a different competitive environment for some species and a different food source for some (the American barn owl, for instance, can ...
Wild boar: This European species was introduced to southern West Virginia a generation or two ago. During colonial times, the black rat, brown rat and house mouse all came to North America, including the future West Virginia, with European settlers and traders.
Several species recently lived wild in Pennsylvania, but are now extirpated (locally, but not globally, extinct). They are the marsh rice rat (Oryzomys palustris), eastern wolf (Canis lycaon), American marten (Martes americana), wolverine (Gulo gulo), cougar (Puma concolor), Canada lynx (Lynx canadensis), moose (Alces alces), and bison (Bison ...
The least weasel is the product of a process begun 5–7 million years ago, when northern forests were replaced by open grassland, thus prompting an explosive evolution of small, burrowing rodents. The weasel's ancestors were larger than the current form, and underwent a reduction in size to exploit the new food source.
In North America, where the ecological niche for rat- and rabbit-sized prey is taken by the larger long-tailed weasel (Neogale frenata), the American ermine preys on mice, voles, shrews, young cottontails, [7] chipmunks, deer mice, jumping mice, and house mice. Usually the ermine kills by biting at base of skull.
Average lifespan of a Japanese weasel is highly dependent on the availability of food and to a lesser extent other factors that affect its life. In the wild it can live for 2 to 3 years with the highest in the range living to about 5 years. [8] The Japanese weasel has a tail ratio of 36–50% while the Siberian weasel has a ratio greater than 50%.