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Creeping vole
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Creeping vole : ウィキペディア英語版
Creeping vole

The creeping vole (''Microtus oregoni''), sometimes known as the Oregon meadow mouse, is a small rodent in the family Cricetidae. Ranging across the Pacific Northwest of United States and Canada, it is found in forests, grasslands, woodlands, and chaparral environments. The small-tailed, furry, brownish-gray mammal was first described in the scientific literature in 1839, from a specimen collected near the mouth of the Columbia River. The smallest vole in its range, it weighs around . At birth, they weigh , are naked, pink, unable to open their eyes, and the ear flaps completely cover the ear openings. Although not always common throughout their range, there are no major concerns for their survival as a species.
== Taxonomy ==
The animal was described in 1839 by John Bachman. The original scientific name was ''Arvicola oregoni'' with a common name of the Oregon meadow mouse. The type specimen was an older male collected November 2, 1836 near the mouth of the Columbia River in Oregon. The specimen had been submitted to Bachman for review by John Kirk Townsend. Subsequent authorities state that it was collected at Astoria, Oregon, which is at the mouth of the Columbia River. In 1857, Baird placed ''Arvicola oregoni'' in a section Chilotus of the subgenus ''Arvicola'' of the genus ''Arvicola''. In 1874, PNAS paper, Coues reclassified Chilotus as a subgenus and refers to the animal as ''Arvicola (Chilotus) oregonus''.〔http://www.mocavo.ca/Proceedings-of-the-Academy-of-Natural-Sciences-of-Philadelphia-1874-Volume-26/568348/198〕 Miller subsequently reclassified the animal in the genus ''Microtus'' and maintained the subgenus ''Chilotus''. This was the first reference to the animal under its current scientific name ''Microtus oregoni''. It was subsequently reclassified to the subgenus ''Mynomes''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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