A solid collection of sites, links, and stand-alone resources, Biology Online seemingly offers all that is biology, at least online. It is an invaluable tool for anyone in need of reliable, authoritative information in the field. Links featured on the site are searchable alphabetically, by specific sub-discipline, or across all sites via Biology Online's search engine. Aside from its extensive and well managed set of recommendations, the site also offers field-specific online tutorials in key areas, as well a 1600 term dictionary.