1) Genus hydromys 2) Mammal genus 3) Water rats 
Hydromys is a genus of rodents in the subfamily Murinae. == List of species == Genus Hydromys - water rats Note: Hydromys habbema Tate and Archbold, 1941 and Hydromys shawmayeri (Hinton, 1943) are placed within Baiyankamys after Helgen, 2005. ...
(from the article `water rat`) Water rats of the genus Hydromys live in the mountains and coastal lowlands of Australia, New Guinea, and some nearby islands. The earless water rat ...
Hydromys is a genus of Australian water-rats peculiar to that continent and Tasmania and New Guinea. The single species, Hydromyschrysogaster is blackish above and golden below, and reaches a length of about sixty centimetres.
[n] - water rats
genus Hydromys noun water rats