The California Natural Diversity Database (CNDDB) is a product of the California Department of Fish and Wildlife's Biogeographic Data Branch (BDB). The CNDDB is both a manual and computerized library of the status and locations of California's rare species and natural community types. The CNDDB includes in its data all federally and state listed plants and animals, all species that are candidates for listing, all species of special concern, and those species that are considered "sensitive" by government agencies and the conservation community. The computerized information is available for a fee in hardcopy and digital forms. The CNDDB is a dynamic system with information continually being added and upgraded. The CNDDB contains over 82,000 locational records for over 2,500 elements (plant taxa, animal taxa, and natural communities). A location record is referred to as an Element Occurrence (EO), and is a site that contains an individual, population, nest site, den, or stand of a special status element. Populations, individuals, or colonies located within 1/4 mile of each other generally constitute a single occurrence, sometimes with multiple parts.