Fat-tailed Pseudantechinus

The fat-tailed false antechinus is a medium-sized dasyurid marsupial that ranges from 18–33 g (0.63–1.16 oz), and has a life span of about seven years.is 9.5-10.5 cm long with a 7.5-8.5 cm tail; it weighs 20-45g. It has a carrot-shaped tail swollen with fat which serves as a food reserve. Its fur is grey-brown. It has litters of up to six young, born in July–September (slightly later further west in the range). It is an insectivorous and nocturnal species.

The P. macdonellensis is commonly found in the rocky environments of Central Australia. In addition it is found throughout South Australia, the Northern Territory and Western Australia. An outlying population in more coastal areas of Western Australia has been reclassified as a new species, Rory Cooper's false antechinus (P. roryi). The species inhabits rocky slopes and plains.

The P. macdonellensis is generally an insectivore whose diet consists of beetles, grasshoppers, and termites. A characteristic specific to this kind of species is its ability to store fat in its tail when food is plentiful.