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

JenniferS wrote:
6 Jun 2025
Oh right. Well, I’m hoping our other wildlife gets busy then. So the black rat can also be very brown? (These are not the slightest bit black).

Rattus rattus
6 Jun 2025
Both species have a large range of body size (which overlap). On average, bush rats are smaller than black rats.

Rattus rattus
JenniferS wrote:
6 Jun 2025
The dingos, quolls and powerful owls need step up then I think. 😐

Rattus rattus
JenniferS wrote:
6 Jun 2025
Right. Well that’s disappointing. But they’re huge. I thought the black rats were smaller….

Rattus rattus
6 Jun 2025
Thanks for the extra pictures. Given the length of the tail (it looks long in the second picture), the size of the ears (will reach the eyes if folded forward) and the clear climbing ability (black rats are very good climbers whereas bush rats tend to stick on the ground) I think its a black rat.

Rattus rattus
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