This auto-run CD-ROM is as an identification key for typical rodent species that may be found in and around the agro-ecosystems of Luzon, Philippines. It offers an easy way of identifying rodent species, especially for the non-taxonomist. By selecting identification characters, the matching species names and photographs are displayed. This also serves as a key to underline the fact that not all rats are pests of rice. Proper species identification is important both for monitoring and management of rodent pest species and for conservation of biodiversity.