This is a list of the mammal species recorded on and around Ascension Island. Ascension Island has two native mammal species, both of which are beaked whales in the genus Mesoplodon. Neither is thought to be at risk, but there is insufficient data collected on them to allow an assessment to be made.
The following tags are used to highlight each species' conservation status as assessed by the International Union for Conservation of Nature:
Order: Cetacea (whales)
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.