Hydromys chrysogaster
Silhouette: Rachel T Mason · PhyloPic
In 3 days ~40% in a week ~60%
The rakali (Hydromys chrysogaster), also known as the rabe, the "Australian otter" or water-rat, is an Australian native rodent first scientifically described in 1804. Adoption of the Ngarrindjeri name rakali is intended to foster a positive public attitude by Environment Australia.
One of four described species in the genus Hydromys, it is the only one with a range extending beyond New Guinea. Having adapted to and colonised a unique niche of a semiaquatic and nocturnal lifestyle, this species lives in burrows on the banks of rivers, lakes and estuaries and feeds on aquatic insects, fish, crustaceans, mussels, snails, frogs, cane toads, bird's eggs and small water birds.
Rakali have a body length of 23–37 cm (9–15 in), weigh 340–1,275 g (12–45 oz), and have a thick tail measuring around 24–35 cm (9–14 in). Females are generally smaller than males but tail lengths are normally the same. They have partially webbed hind legs, waterproof fur, a flattened head, a long blunt nose, many whiskers and small ears and eyes. The body is streamlined with a skull that is large, flat and elongated, with two molars on the upper and lower jaw, similar to the water mouse. They are black to brown in colour with an orange to white belly, and dark tail with a white tip.
Long considered a nuisance animal, rakali were hunted for their soft fur, particularly in the Depression of the 1930s, when a ban was placed on imported pelts such as the American muskrat. With their numbers under threat, a protection order was issued in 1938. However, they were still subject to destruction permits from 1938 to 1957 due to their effect on irrigation banks and alleged damage to fishing nets. Additionally, from 1957 to 1967 a number of licensed seasons were also held for this reason. Wikipedia →
Recording1:00
Australia · 2026
© stephenwwalsh · iNaturalist · CC BY-NC 4.0
Recording0:08
Australia · 2024
© lkosack · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Kosciuszko National Park | 🇦🇺 Australia | |
| 2 | Daintree National Park | 🇦🇺 Australia | |
| 3 | Lamington National Park | 🇦🇺 Australia | |
| 4 | Blue Mountains National Park | 🇦🇺 Australia |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Yerevan Zoo | 🇦🇲 Armenia | |
| 2 | London Zoo | 🇬🇧 United Kingdom | |
| 3 | Frankfurt Zoological Garden | 🇩🇪 Germany |
No species of the same family or order lives in Brisbane, so these are its closest relatives here: other mammals.
With luck
About 10% of wildlife watchers report a Rakali sighting in Brisbane on a given day, based on 164 verified sightings from GBIF citizen-science data. It is the 6th most-seen of the 22 mammals we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
April to August
In those months about 20% of wildlife watchers report a Rakali in Brisbane on a given day, against about 10% in September to March, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Rakali sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 cities where we can rate Rakali sightings, Brisbane has the highest daily chance: about 10%. Next come Melbourne (Australia, about 10%) and Sydney (Australia, under 5%).
GBIF citizen-science records
It is estimated from how often the Rakali is recorded against all the mammals logged in Brisbane (164 verified sightings), 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.
