Counts of American Pikas and Hoary Marmots in North Cascades National Park 2016-2017

USGS scientists counted American pikas (Ochotona princeps) and hoary marmots (Marmota caligata) in North Cascades National Park, Washington, USA during 2016. Hoary...2016年，美国地质调查局（United States Geological Survey，USGS）的科研人员于美国华盛顿州北瀑布国家公园内，对北美鼠兔（Ochotona princeps）与灰旱獭（Marmota caligata）开展了种群数量统计工作。相关内容后续以"Hoary..."起始。