List of mammals of Ireland

The Red List of Irish terrestrial mammals was updated in 2019, with assessments of these 27 species.

[1] The following tags are used to highlight each species' conservation status as assessed on the IUCN Red List: NE indicates not endemic Though most marsupials make up a great part of the fauna in the Australian region, the red-necked wallaby has been introduced to Ireland: a population is currently breeding on Lambay island.

The bats' most distinguishing feature is that their forelimbs are developed as wings, making them the only mammals capable of flight.

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.

Carnivorans include over 260 species, the majority of which eat meat as their primary dietary item.