Wisconsin Silver-haired Bat records emphasize the Lake Michigan migration corridor, including wooded coastal parks, wetlands, and dune systems where traveling bats can feed and roost. The distinct May and October peaks fit spring and autumn passage better than a uniform year-round pattern, and coastal observer coverage may sharpen that signal.
The 48 iNaturalist records are encounters, not a measure of abundance. Grounded migrants, window strikes, rehabilitation cases, and targeted acoustic monitoring are far more likely to generate reports than bats passing unseen over inland forest, so record density cannot be read as population density.
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