Smithsonian Institution
National Museum of Natural History: Walrus
This Smithsonian website has a brief, but thorough, article on the Walrus that also includes pictures and an extensive quote from naturalist Edward Nelson.
Regents of the University of Michigan
Animal Diversity Web: Walrus
A detailed overview of the walrus' characteristics, physical features, behavior, and habitat. Included are some good photos and classification information.
A-Z Animals
A Z Animals: Animal Facts: Walrus (Odobenus Rosmarus)
This entry identifies the defining characteristics of the Odobenus rosmarus, otherwise known as the walrus.