Caption:
Merlin, Falco columbarius 1, and peregrine falcon with duck, Falco peregrinus 2. Pigeon hawk 1, and duck hawk or great-footed hawk 2. Chromolithograph after an ornithological illustration by John James Audubon from Benjamin Harry Warrens Report on the Birds of Pennsylvania, E.K. Mayers, Harrisburg, 1890.