Fat-tailed Dunnart

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by Phoebe Burns
Publish date
4 August 2014
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Phoebe is a University of Melbourne Masters student supervised by Dr. Kevin Rowe at MV. She is passionate about the unique mammal fauna of Australia.

There are 360 mammal species native to Australia. I'd challenge you to name them all, but even as a mammalogist (albeit early in my career) I'm still coming across species I haven't heard of. Even so, there are relatively common species I'm always surprised people don't know, for instance: what is a dunnart?

The Fat-tailed Dunnart (Sminthopsis crassicaudata) is one of 19 dunnart species. It is a small (10-20g) insect-eating dasyurid, which means that although it's mouse-sized, the dunnart is in the same family as the Tassie devil.

Fat-tailed Dunnart Fat-tailed Dunnart (Sminthopsis crassicaudata).
Image: David Paul
Source: Museum Victoria
 

The females give birth a mere 13 days after conception to 8-10 tiny immature young that are about one-eightieth the size of a new-born house mouse. The young suckle for around 65 days, moving from the pouch to their mother's back once they grow too large to fit.

Fat-tailed Dunnart Fat-tailed Dunnart scratching an itchy spot.
Image: David Paul
Source: Museum Victoria
 

Aptly named for their thick tails, the Fat-tailed Dunnart stores about 15 per cent of its body fat in the tail. This provides the animal with a back-up energy reserve during times when food is scarce. Torpor is another method the dunnart uses for dealing with an uncertain environment – when food availability becomes unpredictable they curl up, let their body temperature drop, and their metabolic rate slows. Torpor allows a dunnart to conserve energy when there is so little food around that they would burn more energy finding it than they could obtain eating it.

Fat-tailed Dunnart The thick tail of the Fat-tailed Dunnart contains fat stores that helps it survive in harsh conditions.
Image: David Paul
Source: Museum Victoria
 

Fat-tailed Dunnarts occupy a wide range of habitats across most of south and central Australia. They are one of a few native mammal species that can be kept as a pet in Victoria with a basic wildlife license, provided the animal is legally obtained and not taken from the wild.

If you want to learn more about our native fauna check out the Museum Victoria Field Guide app, and our sister apps for the rest of Australia.

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