The Terrestrial Zoology department of the Western Australian Museum maintains large collections of a wide variety of terrestrial animals, including both terrestrial invertebrates and vertebrates, as well as marine mammals.
The Aquatic Zoology department is responsible for documenting and researching most of the marine, estuarine and freshwater faunal groups of Western Australia, and in some groups a terrestrial component as well.
The Earth and Planetary Sciences department maintains, researches and documents six Earth Science collections comprising of Fossils (invertebrate, vertebrate, plant and trace fossils), Minerals, Rocks, Gems, Meteorites and Tektites, totalling more