Mastacomys fuscus
Silhouette: Rachel T Mason · PhyloPic
In 3 days ~50% in a week ~80%
The broad-toothed mouse or broad-toothed rat (Mastacomys fuscus) is a species of rodent in the family Muridae. It is found only in South-eastern Australia. In Victoria live specimens have been caught in the Snowfields, Great Dividing Range (to Cooma in New South Wales), Gippsland Highlands, Otway Ranges and Wilsons Promontory. Specimens located in scats have been found in the Otway plains and East Gippsland. The species is also recorded in buttongrass sedgeland up to 1000 metres in western Tasmania.
Habitat preferences are areas of herbfields, grasslands and forests with minimal shrubs but a dense covering of sedge, grass, herbs and moss, where precipitation does not fall below 1400 mm per year in alpine areas and others 1000 mm at lower altitudes (DCNR 1995 pp. 208–210).
During the Pleistocene, the broad-toothed mouse dominated Badger Island alongside other grassland-dwelling mammals, but over the course of the Holocene, it and other grassland mammals were replaced with a forest-adapted fauna.
Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kosciuszko National Park | 🇦🇺 Australia |
More parks will be added in future updates.
Possible
About 20% of wildlife watchers report a Broad-toothed Mouse sighting in Kosciuszko National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 11th most-seen of the 11 mammals we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Broad-toothed Mouse in Kosciuszko National Park on a given day, against under 5% in January, April–June and October–November, the lowest months.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Broad-toothed Mouse sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Kosciuszko National Park, in our data
Kosciuszko National Park is the only park on Wallace's Line with enough records to rate Broad-toothed Mouse sightings: about 20% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Broad-toothed Mouse is recorded against all the mammals logged in Kosciuszko National Park (14 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
