These life-size color photos follow a martin nestling from hatching day through fledging day, a total of 30 photos. Laminated to make a valuable tool for landlords, especially when paired with the Prognosticator. Use the photos to determine age of nestlings after hatch, and you’ll know when they’re due to fledge. This set also includes Adult Plumage Photo's for martin sex and age identification. Landlords can use a 3-hole punch and place the 8 1/2” x 11” pages in their field notebook. Especially helpful for Project Martinwatch participants.