golden-bellied water rat

rodent

Also known as: Hydromys chrysogaster

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July 16, 2026

Quick Summary

The golden-bellied water rat (Hydromys chrysogaster), also known as the beaver rat, is the largest of the 18 species of amphibious, carnivorous rodents called water rats. These animals are adapted for hunting in water and burrowing along waterways. They have small eyes, closable nostrils, and dense, water-repellent fur. Their hindfeet are large and webbed, aiding in swimming.12

The golden-bellied water rat inhabits freshwater lakes, estuaries, rivers, and mangrove swamps in Australia and New Guinea. It is tolerant of polluted waters and preys on a variety of invertebrates and vertebrates, including insects, snails, fish, frogs, and birds. While most water rats are nocturnal, some species are active during the day. These rodents belong to the mouse family, Muridae.1

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water rat
Natural history
The golden-bellied water rat (Hydromys chrysogaster) of Australia and New Guinea is the largest, with a body 20 to 39 cm long and a slightly shorter tail (20 to 33 cm). Living by freshwater lakes, estuaries, and rivers and in coastal mangrove swamps, it is tolerant…
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The golden-bellied water rat (Hydromys chrysogaster) of Australia and New Guinea is the largest, with a body 20 to 39 cm long and a slightly shorter tail (20 to 33 cm). Living by freshwater lakes, estuaries, and rivers and in coastal mangrove swamps, it is tolerant…
Read More