To most people, a rat is one of the undesirable introductions to Australia by the early settlers. There are however, many Australian native rats; placental mammals that produce live young in an early stage of development. These rats entered the continent in relatively recent times; long after the arrival of marsupials, but still long before Europeans and the introduced Black and Brown Rats arrived. Despite the dominance of marsupials in Australia, many of our native rats successfully established themselves in a range of habitats.
A Bush RatPhotographer / Source: Gary Lewis
The Bush Rat, Rattus fuscipes, is a small compact mammal with an average length of 310 mm (160 mm body + 150 mm tail) and an average weight of 160 grams. The fur is soft and dense, varying from grey brown to reddish brown above and grey to light brown below. The tail length is shorter than the head and body length, which is a useful diagnostic feature. It can be separated readily from marsupials by its typical paired, yellow-orange faced, upper and lower incisors.
Bush Rats are common throughout much of coastal mainland Australia. There are several sub-species, of which the best known is Rattus fuscipes assimilis from the south-east. It occurs in a wide range of habitats from sub-alpine heaths to coastal scrub, wherever there is dense ground cover, but it is absent from the Mornington Peninsula. It prefers a vegetation cover of shrubs and ferns.
Bush Rats have a mixed diet, which includes insects and vegetation such as leaves, fruit, seeds and fungi. This diet aids its survival under such adversity as bush fires. It can survive periods of food shortage after a bushfire by feeding on the rapidly emerging fungi.
The Bush Rat of the southeast is capable of breeding in all seasons, but as a rule does not breed in winter. The usual litter size is five, and in a good season a number of litters may be produced. From a birth weight of about 5 g, the young become independent when they are about four weeks old, and are capable of breeding in the wild at about four months of age.
Bush Rats are widespread and common and are secure in suitable habitat.
Menkhorst, P. and Knight, F. (2001). A field guide to the mammals of Australia. Melbourne: Oxford University Press.
Menkhorst, P. (Ed.) (1995). Mammals of Victoria. Oxford University Press. Melbourne
Strahan, R. (Ed.) (1995). The Mammals of Australia. Reed. Chatswood. N.S.W.
Hi there, thanks for your question – I’ve referred your question to the Museum’s Collection Manager for Birds & Mammals for his advice – we’ll get back to you soon with some more information.
Hi Luisa. Authoritative information about how to deal with native species in the home can be found on the Native Plant Plants and Animals pages of the Department of Sustainability and Environment website. Enjoy!
Hello, Heidi. What an interesting encounter! However, according to this webpage at the Australian Museum, it is highly unlikely that the droppings in your ceiling come from a native species. The native rat probably scampered off to some other home - closer to the ground. Hope this helps!
Hi Deb - We checked with our Mammalogy collection manager, and he says that whilst there is no precise data, domesticated rats live on average 2 years, and it is expected that bush rats would have a similar lifespan.
Hi Steph. We have had a chat to our Coordinator, Live Exhibits and Forest Gallery about the babies. He recommends that you get in touch with Territory Wildlife Park, which isn't far from you. They will be familiar with the mammals of the area and the care required if they are a native species. Good luck with the babies!
Hi Rod - The information in our infosheet, and a similar one from the Australian Museum here would indicate that the bush rat's diet includes fungi, grasses, fruits, seeds and insects, with no mention of bird eggs. This press release from Taronga Zoo states that "[the bush rat] doesn't climb trees to raid bird's nests[...]".
Hello! Given the location, a rat with a tail as long as, or longer than, its body is almost certainly an introduced Black Rat, rattus rattus. Despite the name, these rats can vary a great deal in terms of colouring, from a light brown to black.
Hi Robyn. Unfortunately this is not a Bush Rat hole. In suburban Croydon the Bush Rat is absent and they appear to totally avoid human settlement. The hole you have seen was most likely dug by one of the introduced rats, that is one of the Black or Brown Rats. These rats dig holes up to 90 mm diameter, they can climb and will eat almost anything available. Contrary to their name, these rats may be of a varied colour especially about the belly and chest.
Hi Jack and Sam – Museum Victoria offers a free identification service and it would be great if you are able to send us your photos of the rat you saw at Mount Martha. Please read our identification guidelines before submitting your request. We look forward to seeing your pictures!
Hi David - The Museum's Mammalogist inclined to think that the animal you have noticed is the Black Rat. He has advised Bush Rats rarely if ever attend human settlement preferring the natural bush. Since the standard texts do not give a precise indication of where these rodents place their nest it is difficult to get an accurate idea of its placement. Needless to say if the indications are that these rats do not frequent habitation then it can also be assumed that they do not breed there. Rats generally are very fast developers, a seemingly defenceless and blind individual could be out running and feeding quite independently a day or two later; also the female could move the lot if she considers that danger threatens. We hope this information helps!
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Hi Marjorie - As the common vernacular suggests the Bush Rat is an inhabitant of bushy areas, they will not enter and especially live in human dwellings. Rats in general have an excellent climbing ability so that can’t be used as an indication of species identification. The tail length and ear shape and size should be good ways to identify the species concerned, although I am rather thoughtful of the Black Rat in your instance. Should you still be troubled as to the species is it possible to take an image of the rat and send it through to the Discovery Centre for identification.
Hi Kim. It would be great if you could send an image for us to send to our experts. Please submit your photo and description through our Identifications page.
Hi Janine, our Collection Manager for Mammalogy thinks this is an interesting observation. The fact that they were seen digging and the size almost certainly removes any local Antechinus from the equation, and the size, notes on ears shape and tail length removes the introduced Black Rat. This leaves us with any local native rats; the commonest and most expected are the Bush Rat and the Swamp Rat. These can be separated by, amongst various subtle features, the colour of the feet - dark in the latter species and pale in the former. From what you say I would suspect that they were Bush Rats. These mammals are like other rats in that while principally nocturnal they are known to occasionally leave shelter during the day in search of foods. Had a size not been mentioned and they were larger then another animal for consideration, and a well known hole digger, is the bandicoot.
Hello, Olivia. We referred your enquiry to the relevant Collection Manager who requested a photograph of the animal to offer a positive ID. This can be done via at our Ask the Experts page. Even without a photograph the Collection Manager suspects that the animal is not a native bush rat, as the animal you mention has a paler belly and is active about the residue food left for the possums.
Hi Mary Anne, unfortunately Curators and Collection Managers require an image or specimen in order to provide accurate identifications. Next time you see the critter in the garden, see if you can take a photo, you can then email it in to us here in the Discovery Centre.
Hi Kim, all rats, both introduced and native have the hopping ability. If it was in an urban area such as mentioned here the animal would be either the introduced Black Rat or the introduced Brown Rat.
Hi Ian, we have asked the Collection Manager of Ornithology and Mammalogy and he thinks what you have heard may have been a rat. This noise is often uttered if distressed, such as when caught by a predator (cat, dog, snake...) or trapped. Maybe the animal in question had been injured and was reacting in relation to this.
Don - without knowing if the animal in question is a native or introduced rodent, it is difficult to know what to suggest. One idea might be to relocate the birdseed feeding station away from the car to make it a less convenient feeding spot for the animals in question.
It is worth noting that native rats such as Bush Rats and Swamp Rats generally have more particular diets than introduced rats and mice; and are not renowned for varying their diet from native plants, etc. Wiring is only likely to be chewed by any rodent when all other food resources are exhausted.
Hi Phred, I think its important to know exactly what species of Rat you are describing here; there is a possibility that you may have Black Rats Rattus rattus rather than Bush Rats Rattus fuscipes. As a rule, Bush Rats are not regarded as commensal and as such are unlikely to persist with invading human habitations if their preferred food of forest-dwelling arthropods and plant tissue is in good supply. Also, the colouration you described isn't a relaible guide to distinguish a Bush Rat from a Black Rat, as both are highly variable in colour.
When next you see one, check if the tail of the Rat is longer than the rest of the animal's body, and if it has protruding round ears, if so it is most likely a Black Rat. Alternatively, feel free to send us any photos if you have a chance and we can identify it ; just use the "Contact Us" link at the bottom of this page
Hi Matt. Predators of bush rats are introduced vertebrate species such as cats and foxes, however they appear to be doing quite well as their CSIRO conservations status is ‘lower risk’. An interesting article in Journal of Applied Ecology by P Banks Vol 36 Issue 6 Dec 1999, describes research where foxes were removed from bush rat territory and yet it made no significant difference to the population. Their major threats appear to be loss of coastal habitat due to land clearing, or excessive wildfires. Encroachment on their habitat by other animals, such as the Black Rat, is also a potential threat to them.
Hi Sabrina - there are a few issues here; there is a distinction between protected and threatened/endangered species, and the responsibility of the land developers in this case differs greatly depending on which description applies to these animals. All native vertebrates are 'protected' to a degree (in that they are not an introduced pest species), whereas threatened/endangered species have a far greater degree of protection via the Flora and Fauna Gurantee Act.
From your description they could also possibly be Swamp Rats, which is another native Rat species, however neither of these are considered endangered and are not on the Flora and Fauna Guarantee Act. We suggest you contact the Department of Sustainability and Environment via http://www.dse.vic.gov.au/ regarding what rodents are on teh Flora and Fauna Guranatee Act.
Hope this helps
Hi Michelle - yes, the Black Rat Rattus rattus does indeed build extensive shallow burrow systems, as does The Swamp Rat Rattus lutreolus and Bush Rat Rattus fuscipes. The burrow alone doesn't help identify which animal made it, unfortunately - if you ever see one of the inhabitants, you can use the information here to identify which type of rat you have.
You can find out lists of mammals found in any particular part of Victoria by using our Bioinformatics site at http://flyaqis.mov.vic.gov.au/cgi-bin/texhtml?form=bio_mammviccom; simply select the grid which includes your area/s of interest and search to find listings of the mammal records in your area.
Hello Brielle
Bush Rats are not kept as pets, their diet and habits are poorly suited to being kept in captiviy. For many native species of mammal a permit is required, you can learn more on this document published by the DSE http://www.dse.vic.gov.au/__data/assets/pdf_file/0019/119053/Application-for-a-Private-Wildlife-Licence-v11-1.pdf
Give a Bush Rat is very similar in appearance to other closely related rodents that are commonly kept as pets such as Black Rats, you may want to consider this as an alternative.
Hi Kyra,
Unfortunately the Discovery Centre cannot provide an identification of the rat with your description. If possible, take a photograph of the rat and submit it through our identification website. We look forward to hearing from you!
Hi Heather - I'm not sure we are the right place to offer help; we may be able to identify the animal if you can send us images, but to offer help in saving it you would better placed contacting an animal rescue service such as Sydney Wildlife, who have a rescue service via their website at http://www.sydneywildlife.org.au/
Hi Jo - to make a full identification we would need to see images of the animal in question, however it is worth noting that the native Bush and Swamp Rats are known from the Newcastle area, as are the introduced Black and Brown Rats. The tail length to body ratio you mentioned may indicate that you have one of the native species, however a formal identification can't be made without clear images. If you have pictures, fel free to send them to us via "Contact Us" at the bottom of this page and we will do our best to help.
Hi Coral - we would need to see a specimen in order for us to provide an identification; the Black Rat Rattus rattus and the two most commonly encountered native rats (R. lutreolus and R. fuscipes) have some degree of burrowing habits, however it is worth noting that the natives are markedly less commensal in habits (i.e., they shy away from human habitations), so on the basis of this it is likely you are describing the introduced Black Rat.
If you are able to get a photograph to us (which you can send us via the "Contact Us" link at the bottom of this page), we will be happy to suggest a more definitive identification if possible.
Hi Glennis, without seeing a clear image of the animal in question it is impossible to be certain of the species you have, but the behaviour you describe doesn't sound like a Bush Rat. Bush Rats are not regarded as commensal (that is, unlike introduced rodents they don't generally associate with human habitations), and also Bush Rat's preferred diet of invertebrates, seeds, fruits, plant tissue and fungi renders them unlikely to be responsible for eating the soap - this sounds more like the behaviour of a Black Rat.
If you are able to send us any images of the animal in question, please do so via the 'Contact Us' link at the bottom of this page and we can see if the identity of the rodent in question can be determined. As a rule of thumb though, if the tail of the animal is longer than the remaining body length, the individual will most likely be a Black Rat.
Hi James - I'm sorry to report that it isn't possible to identify the rat you describe without seeing an image; if you manage to get a clear image of one of the animals, feel free to send it to us via the "Contact Us" link at the bottom of this page. Bush Rats can be quite variable in colour, but so too can the introduced Black Rat. To further confuse issues, another native rat species called the Swamp Rat Rattus lutreolus can also have a grey pelt, but colouration is not diagnostic between these three species as all of them exhibit variability in their pelt colour.
Bush rats have rounded ears, whereas black rats have thin pointed ears;
Bush rats’ tails are shorter than their body length, whilst the tails of black rats are as long or longer than their body length.
It’s unlikely you’ll find a type of bait or a trapping location that would guarantee the capture of black rats alone.
Hi Catherine - whilst it is probably the Black Rat Rattus rattus that you are describing, you should also be aware that the native Swamp Rat Rattus lutreolus is also known from Edithvale and further along the Mornington Peninsula. You are probably right in saying the rats in question aren't Bush Rats Rattus fuscipes (also a native) as they generally don't live in this region, however Swamp Rats may account for some of the rats seen in the Edithvale area.
If ever there is a chance to photograph one of them, feel free to send the picture to us via the 'Contact Us' link at the bottom of this page and we'll see if we can determine which species it is.
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