The water-rat, Hydromys chrysogaster (family Muridae), is black or dark grey above and white or orange below. It is found mainly near permanent bodies of freshwater, occasionally at temporary waterholes.Water-rat figures as the spouse of Moon in one traditional story.
Muridae is esembriomys gouldii (black-footed tree-rat, "mouse")
Pseudomys delicatulus (delicate mouse, "mouse")