American ermine reports cluster at Seney, Shiawassee, and Detroit River national wildlife refuges, sites that span Michigan from the Upper Peninsula’s boreal wetlands to the southern Great Lakes shore. All 86 records come from iNaturalist alone, with no GBIF specimen data behind them, unusual for a weasel this widely distributed across the northern hemisphere.
Sightings peak in June and July, when the animal’s brown summer coat makes it easier to spot against green cover than its white winter coat against snow. NatureServe ranks the species S4, Apparently Secure, in Michigan; the modest record count says more about how rarely this small, fast-moving predator is noticed than about scarcity.
Full species profile
