Big brown bats are among Iowa’s most adaptable bats, roosting in buildings as well as tree cavities and feeding over water, woodland edges, and open neighborhoods. Their tolerance of developed landscapes helps keep them visible even where natural roosts are limited.
Maquoketa Caves State Park, the wooded Driftless Area, and the Upper Mississippi refuge corridor all pair roosting structure with productive insect habitat. Caves and occupied roosts should never be entered or disturbed, particularly during hibernation or maternity season.
The record set spans the year but is dominated by active-season observations, especially June and August. Midwinter reports may involve hibernacula or indoor discoveries rather than bats routinely flying in Iowa cold.
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