Silver-haired bats don’t cluster in caves the way many Oregon bats do. They roost alone or in small groups under loose bark or inside cracks in dead and dying trees, which keeps them easy to miss even where they’re regularly present. The Columbia River Gorge, with its steep, forested walls, anchors the single named site in the state’s record.
Records show two bumps, June and a stronger one in August, rather than one continuous summer high, a pattern that fits both a maternity-season rise and a migratory species that moves through Oregon on its way to and from wintering grounds. NatureServe ranks the species S3, vulnerable, in Oregon, a step below its secure global status.
Full species profile
