VIREO (VIsual REsources for Ornithology)
VIREO (vireo.ansp.org), the most comprehensive bird image bank in the world, was started in 1979 to provide a centralized and well-curated collection of avian photos for scientific and public use. VIREO contains more than 150,000 images representing over 7,000 species from around the world. Its contributors include some of the best wildlife photographers around.
VIREO licenses bird images for a wide variety of commercial and non-profit uses. It also sells digital images for lectures. There are more than 72,000 images in VIREO's online bird image database. More are being added daily.