License, verbatimPD
The National Gallery of Art: open access image with no usage restrictions under the NGA's open access policy (openaccess=1 in the Gallery's published_images dataset).
Alexander Lawson after Alexander Wilson. Carolina Cuckoo, Black-billed Cuckoo, Blue Yellow-backed Warbler, and Yellow Red-poll Warbler, published 1808-1814. National Gallery of Art, Washington.