Rodents


PHOTOGRAPHY OF SMALL MAMMALS FOR IDENTIFICATION

Most photos of small terrestrial mammals submitted to Canberra Nature Map for identification that were photographed in the Canberra suburban area are of a Black Rat (Rattus rattus).  The next most likely species is the House Mouse (Mus musculus). Outside the city, at present, photos of Black Rats outnumber all other small mammal photos combined. However you may have found something different.  Here are some tips for what to include in your photos to increase the potential for correct identification:

  • An image that is sharp, not blurry;
  • A scale;
  • A view of the whole animal (preferably stretched out if it is a carcass);
  • Views of every surface -  (not always possible but ideally this includes a profile of the head, good views of the ears, the belly, the pads on the hind feet, and a good view of the fur and  skin on the tail from below and above);
  • Views of the teeth; and
  • a count of the number of teats

Anti-coagulant poisoning is seen frequently.
Most rats seen about in daytime in southern areas of Australia are moribund due to baiting with anti-coagulant toxins such as Brodifacoum. As such they are attractive to birds such as owls and raptors, which are very sensitive to 2nd generation anti-coagulants such as Brodifacoum. 1st generation products such as Warfarin are less dangerous because they are metabolised more quickly by the victim. Moribund rats should be picked up under a towel, then humanely killed. All carcasses should be disposed of where animals cannot get them. A better approach is to rodent-proof food sources  such as chook feeders, hen houses, and compost containers; and to use traps rather than baits. New age 'deterrents' such as Ultra-sonic devices do not work.


Rodents

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Discussion

DonFletcher wrote:
Yesterday
Hi @Jennymec , for decades, the only small mammals in the Canberra suburbs have been the Black (Roof) Rat (Rattus rattus) and the House Mouse (Mus musculus). There have also been a few claims for the Norway (Sewer) Rat (Rattus norvegicus). Of course our nearby waterways have the native Rakali (Hydromys chrysogaster) but I dont know of one coming in among houses. However your first and second images do not look exactly like a Black (Roof) Rat (Rattus rattus). I dont know what they do look like. The short tail and dumpy appearance reminded me of Swamp Rat (Rattus lutreolus/lutreola) which we do not have in the ACT. I think this must be R. rattus but I have left it as uncertain. If you can get better images ....

Rattus sp.
DonFletcher wrote:
25 May 2025
I agree.

Rattus rattus
25 May 2025
I suggest its a black rat - the tail is long (longer than the head/body), the ears are large (the test is if folded forward they go past the middle of the eye - hard sometimes to determine from photos) and the head is pointed. Also black rats are very good climbers.

Rattus rattus
arjay wrote:
24 May 2025
We have two. A agilis and A stuartii.

Rattus fuscipes
DonFletcher wrote:
24 May 2025
Do you know which Antechinus?

Rattus fuscipes
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