Iowa sits near the northern edge of the evening bat’s range, and since 2000 the state has just 2 records, one from Adams County and one from Marion County, both in the southern half of the state. This is a tree-roosting bat of the Southeast that reaches up into Iowa’s oak groves and river corridors during the warm months.
Both records come from July, which fits a summer visitor but is far too few to sketch a season. Evening bats migrate, leaving Iowa before the cold and returning when insects are flying again.
Even so, NatureServe’s Vulnerable (S3) rank in the state reflects how little is nailed down. Both recent records are iNaturalist observations, and a small brown bat over a pond at dusk usually takes a net or a detector to identify, which helps explain why so few reach the record. Any mature riverside timber in southern Iowa could shelter colonies in summer.
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