Noun
Any of several rats:
Rattus sordidus (syn. Rattus conatus), a burrowing species that forms underground colonies, found in Australia.
Rattus tunneyi, found in a variety of habitats, found in north and eastern Austrlia
Rattus nitidus, Himalayan field rat.
Ratus exulans, found in the Pacific Islands.
Rattus rattus argentiventer, found in the Tropics.
Maxomys surifer (syn. Rattus surifer solaris).
Source: en.wiktionary.org