American ermine, the short-tailed weasel that turns white in winter, holds 23 Wyoming records, 22 of them research-grade iNaturalist observations, most from the state’s northwest. Teton County has 8 and Park County 7, with Yellowstone and Grand Teton national parks the most-named sites, a spread that follows where hikers and photographers go as much as the ermine itself.
All the dated records fall between June and September, with August holding 10, a pattern that likely tracks when people are out in the high country rather than the ermine’s own activity, since this species hunts year-round beneath snow as readily as in open grass. With only 23 records, that timing shouldn’t be read as a true activity calendar.
Full species profile
