Two barn swallows looking out of their mud huts

barn swallows mud huts ohio bird species bird nests nesting behavior avian habitat wildlife nature bird watching avian architecture nesting sites swallow nests nesting season bird families natural habitat wildlife photography barn swallow ecology nurturing young mud nests avian homes swallow conservation rural ohio barn swallow behavior barn swallows in ohio behavior nesting site avian species birds birdwatching colony habitat mud