Mammals were a galactic summary of a group of vertebrate animals whose females were characterized by the possession of mammary glands while both males and females were characterized by sweat glands, hair, three middle ear bones used in hearing, and a neocortex region in the brain. Most mammals gave birth to live young, but there were exceptions. Humans were mammals, as were Wookiees.
Technically, mammals appear in almost every Star Wars work. The following is a list of media in which mammals are specifically referred to:
- The Wildlife of Star Wars: A Field Guide
- The Essential Guide to Alien Species
- Ultimate Adversaries
- Knights of the Old Republic II: The Sith Lords: Prima Official Game Guide
- Suns of Fortune
- Star Wars: Age of Rebellion Core Rulebook