An export of data from the Hesperomys Project. The Hesperomys Project is a database of taxonomy and nomenclature, focused on mammals but also covering some other groups, principally other fossil tetrapods. The database contains information such as: Taxonomic classification for all mammals, living and extinct References to original citations for the vast majority of names Type specimens and type localities for numerous names The full database is available online at hesperomys.com. This export contains: name.csv: Data on names, including taxonomic context, authority, citation, type locality, type specimen, and classification of the etymology. taxon.csv: Data on taxa, including classification and authority collection.csv: Data on collections that contain type specimens, including name, location, and number of type specimens in the database The code used to generate the exports is on GitHub.