The common rock rat (''Zyzomys argurus'') is a species of

rodent Rodents (from Latin , 'to gnaw') are mammals of the order Rodentia (), which are characterized by a single pair of continuously growing incisors in each of the upper and lower jaws. About 40% of all mammal species are rodents. They are n ...

in the family Muridae. It is found only in Australia, where it lives in the rocky areas of woodlands, grasslands and low open forests, particularly on the talus, or

scree Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall. Landforms associated with these materials are often called talus deposits. Talus deposits typically ...

, of cliff slopes. As a nocturnal animal, it spends the daytime nesting in cool rock crevices. Direct exposure to the sun can quickly result in

heat stroke Heat stroke or heatstroke, also known as sun stroke, is a severe heat illness that results in a body temperature greater than , along with red skin, headache, dizziness, and confusion. Sweating is generally present in exertional heatstroke, ...

and death.Cronin, Leonard and Westmacott, Marion
Cronin's key guide Australian mammals
Allen & Unwin, 2008, p. 176. , The rock rat is an overall golden brown with white belly. It can weigh anywhere 25–65 grams, with a head to body length of 85–140 mm. The thick tail is 90–125 mm long and contains fat deposits. The tail is covered in overlapping scales and sparse hairs. The skin of the tail can easily be pulled off, allowing the animal to escape predators in some situations (this function is similar to that of lizard tail

autotomy Autotomy (from the Greek ''auto-'', "self-" and ''tome'', "severing", αὐτοτομία) or self-amputation, is the behaviour whereby an animal sheds or discards one or more of its own appendages, usually as a self-defense mechanism to elude ...

). They are sexually mature at 5 to 6 months of age. The females have 4 nipples but litters average 2 to 3 offspring. Gestation is about 35 days. By the 10th day, the offspring are covered in fur, and by the 12th day their eyes are open. They are weaned by 4 weeks of age. The life span of the Common Rock Rat in the wild is unknown, but an age of 4.2 years in captivity has been reported.Weigl, Richard (2005), Longevity of Mammals in Captivity: from the Living Collections of the World, E. Schweizerbart'sche Their diet consists of plant matter, grasses, seeds, fungi and insects. One was observed in Maguk, Kakadu National Park, tucking into a plate of custard and rice pudding that someone had left unattended (Goodfellow, Fauna of Kakadu and the Top End, 1993).

References

* Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 ''in'' Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore. {{Taxonbar, from=Q681885 Zyzomys Mammals of Western Australia Mammals of the Northern Territory Mammals of Queensland Rodents of Australia Mammals described in 1889 Taxa named by Oldfield Thomas Taxonomy articles created by Polbot