Year-round occupancy of cliff swallow mud-nests by several bat species has been observed throughout California, but formal documentation of these observations is limited to project reports. Bats roosting in cliff swallow mud-nests will be subject to direct impacts if they are present when these nests are removed to prevent swallows from nesting. In 2022, the California Bat Working Group compiled records from working group members and provided recommendations for take avoidance, including nest inspections and habitat modification to discourage occupancy. Here we'll discuss those records and share information on bat roosts in cliff swallow mud-nests.
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