beaver rat

US /ˈbiːvər ræt/
UK /ˈbiːvər ræt/
"beaver rat" picture
1.

a large, semi-aquatic rodent (genus Hydromys) native to Australia and New Guinea, known for its webbed hind feet and waterproof fur

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The beaver rat is an excellent swimmer and diver.
We spotted a beaver rat near the riverbank.