Smithsonian Institution
National Museum of Natural History: Snowy Owl
This Smithsonian website has a brief, but thorough, article on the Snowy Owl that also includes a picture and an extensive quote from the 19th Century naturalist Edward Nelson.
Lincoln Park Zoo
Lincoln Park Zoo: Snowy Owl
Lincoln Park Zoo presents facts on the snowy owl, including its physical description, it's habitat, it's niche, and it's life history.