 The initial funding phase of PetDB (1996–2001) supported the development of the database structure and population with data values.Renewed funding (2002–2007) permitted the migration of the database into an ORACLE-based environment administered by the Center for International Earth Science Information Network (CIESIN) of Columbia University, continued data entry, and enhancement of the web-interface with a more user-friendly design.PetDB is now maintained by EarthChem and funded by the US National Science Foundation as part of the Interdisciplinary Earth Data Alliance facility.