Long-tailed weasels turn up most often around Starved Rock State Park, refuge lands along the upper Mississippi, and forest preserves in northern Illinois, the hedgerows and brushy edges this weasel favors over open fields or deep woods. The state’s 395 records since 2000 make it one of the better-documented small carnivores here, and NatureServe ranks it S4, Apparently Secure, statewide.
Reports peak sharply in March and April, when close to a third of the year’s sightings land. That’s not necessarily when weasels are busiest; it’s likely when people are out walking field edges and more apt to notice the animal’s fast, bounding gait against still-thin spring cover.
This is the most widely ranging weasel in the Western Hemisphere, found in every US state except Hawaii, and Illinois sits well within that range. A long-tailed weasel can kill prey several times its own weight with a single bite, then drag the carcass down a rodent’s own burrow, the same tunnel it will often reuse as a den.
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