Members of the order Rodentia are characterized by having a pair of continuously growing incisors on the upper and lower jaws. The teeth of these mammals must be worn down by constant gnawing to keep them from growing in a disfiguring and potentially lethal manner. Wyoming rodents are an extremely diverse group and range from the terrestrial little Silky Pocket Mouse (5-10 grams), to a medium sized aerial Northern Flying Squirrel (105-170 grams), to the large, web-footed and water loving American Beaver (11-35 kilograms). There are 51 species of rodents in Wyoming.
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