This is a list of the mammal species recorded in Nauru. There are 4 mammal species in Nauru, all of which are marine mammals of the order Cetacea.
None of the 4 species have been assessed by the IUCN, as there is inadequate information to make an assessment of the risks to these species, so all are marked DD (Data Deficient).
The order Cetacea includes whales, dolphins and porpoises. They are the mammals most fully adapted to aquatic life with a spindle-shaped nearly hairless body, protected by a thick layer of blubber, and forelimbs and tail modified to provide propulsion underwater.
References
List of mammals of Nauru Wikipedia(Text) CC BY-SA