Drawing on the expertise of lepidopterists and other such experts at Montana State University's Big Sky Institute and the National Biological Information Infrastructure program, this site is a database that provides easy-to-use information about over 2800 species of butterflies and moths. On the site, visitors will find dynamic distribution maps showing verified species occurrences, photographs of the adult and caterpillar (when available) and a cornucopia of species accounts. Users may wish to look over the "Taxonomic Groups" area if they just wish to browse around, or they can also perform a map search, or even just browse image thumbnails by family. Those who are new to the field may wish to look over the online glossary or external links, and those who are ready to lend assistance should check out the "Get Involved" area. [KMG]