(Table 1) Rodent (lemming and vole) densities in 5 study areas in the Canadia...

Lemmings construct nests of grass and moss under the snow during winter, and counting these nests in spring is 1 method of obtaining an index of winter density and habitat use....旅鼠（Lemmings）会在冬季于积雪下方构筑由草类与苔藓构成的巢穴；春季对这些巢穴进行计数，是获取其冬季种群密度与栖息地利用情况指数的一种方法。