Biologist Judy Camuso has been a volunteer owl bander for the last 20 years. Each fall, she captures, weighs, measures, bands and releases hundreds of the birds in her backyard in Freeport. She holds a young saw-whet owl for visitors to see after freeing it from her net. Derek Davis/Staff Photographer

Camuso holds a young saw-whet owl for visitors to see before releasing it back into the wild. Derek Davis/Staff Photographer

Camuso frees a young saw-whet owl from her net. Derek Davis/Staff Photographer

Camuso holds a young saw-whet owl while demonstrating the banding process to a group of visitors at her home. Derek Davis/Staff Photographer

Camuso holds a young saw-whet owl while demonstrating the banding process to a group of visitors at her home. Derek Davis/Staff Photographer

Jim Howe of North Yarmouth listens to the heartbeat of a saw-whet owl. Derek Davis/Staff Photographer

Camuso holds a young saw-whet owl while demonstrating the banding process to a group of visitors at her home. Derek Davis/Staff Photographer

Camuso spreads the wing of an eastern saw-whet owl under an ultraviolet light to show visitors how to determine the age of the owl by the amount of blood supply (pink) in their feathers. Derek Davis/Staff Photographer