It was considered extinct since it was last recorded in 1906, but it was rediscovered in 1997. A smaller, related rice rat was also rediscovered—the Fernandina rice rat (Nesoryzomys fernandinae) on Fernandina.[3]
^Dowler, R.C., Carroll, D.S. and Edwards, C.W. 2000. Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands. Oryx 34(2):109–118.
Tirira, D., Dowler, R., Boada, C. and Weksler, M. 2008. Nesoryzomys swarthi. In IUCN. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on November 29, 2009.