List of mammals of Portugal

The following tags are used to highlight each species' status as assessed on the respective IUCN Red List published by the International Union for Conservation of Nature: Rodents make up the largest order of mammals, with over 40% of mammalian species.

They have two incisors in the upper and lower jaw which grow continually and must be kept short by gnawing.

The order Erinaceomorpha contains a single family, Erinaceidae, which comprise the hedgehogs and gymnures.

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.