Wisconsin records connect Big Brown Bats with the forest and lakes of Chequamegon-Nicolet, the Mississippi floodplain, and the wooded bluffs around Devil’s Lake. Together those sites offer summer feeding water and trees or buildings for roosts; July–August is the strongest reporting period, when maternity colonies are active and newly flying young increase detections.
The 163 iNaturalist records count submitted encounters, not bats or colonies. Roost discoveries, rehabilitation intake, acoustic surveys, and repeat observations near occupied buildings can heavily weight particular places, while a lack of records elsewhere does not demonstrate low abundance.
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