Critters that call the Moreton Bay Ramsar Wetland home: the Water mouse (Xeromys myoides)

Water mouse (Xeromys myoides)

Other Names: False water rat, yirrkoo

Conservation status: Vulnerable (Commonwealth Environment Protection and Biodiversity Conservation Act 1999; Nature Conservation Act 1992)

The water mouse is a native rodent that inhabits coastal freshwater and intertidal environments, including saltmarsh, mangroves and wetlands.

In Queensland, discontinuous populations have been recorded along the coast from Proserpine in the Whitsunday Region to the Queensland-New South Wales border, including K’gari (Fraser Island), Bribie Island, and Minjerribah (Stradbroke Island). Higher density populations occur within Pumicestone Passage and southern Moreton Bay, where a large proportion of their range falls within the Moreton Bay Ramsar wetland.

Fun fact: Unlike water rats, the water mouse does not have webbed feet. It is for this reason they came to be known as the ‘false water rat.’

They are one of Australia’s rarest rodents and very little was known about the species before the late 1990s when the first field surveys were conducted.

The water mouse has small eyes and short round ears and is covered in silky, water-repellent, slate-grey fur with a pure white underbelly. They can grow up to 126mm in body length and weigh up to 64g.

The species is mostly active at night and is known to hunt a variety of prey, including crabs, lobsters, marine worms, snails and molluscs. During the day they shelter in distinctive nests resembling termite mounds, constructed of leaves, peat and mud. These mounds can be up to half a metre tall and provide protection from tides and predators as well as a safe place to rear young.

The main threats to the water mouse are habitat loss, fragmentation and degradation. Urban development, resource extraction and wastewater discharge impacting water levels and quality can have direct and indirect effects on water mouse populations. Other pressures include introduced predators such as foxes and feral dogs and cats, habitat damage caused by recreational vehicles and climate change impacts such as sea level rise.

The Australian Government’s National recovery plan highlights key conservation actions to improve the conservation status of the water mouse, including conducting surveys, mapping and research to improve our understanding of their biology, distribution and habitat, monitoring population trends and identifying and managing threats and pressures, rehabilitating habitat and increasing community awareness and involvement.

If you’re walking through the Moreton Bay Ramsar Wetland and you catch a whiff of pilchards and mouldy leather, there could be a water mouse nearby!

Healthy Land and Water is helping local water mouse populations as part of the Moreton Bay Ramsar Wetland project, by working with Quandamooka Yoolooburrabee Aboriginal Corporation (QYAC) to reduce fox and feral cat populations on Minjerribah. This project aims to reduce predation of Xeromys myoides and hopefully help the water mouse populations recover.

You can help protect the water mouse by keeping cats indoors, keeping dogs on leashes when walking through wetland environments, and report fox sightings to local government or local land managers.

The Moreton Bay Ramsar Wetland project is delivered by Healthy Land and Water with support from the Australian Government’s National Landcare Program.

Popular Stories

SEQ Rainfall and Flooding 2022 Recovery Grants - More time to apply!

Explore News
  The deadline to apply for an Extraordinary Disaster Assistance Recovery Grant (EDARG) has been extended to 10 March 2023!  Up to $75,000 is available for primary producers and $50,000…

Healthy Land and Water 2018: A year in review

Explore News
2018 HAS been a momentous 12 months for Healthy Land and Water; a year filled with success and progress as we continue our mission to improve and protect South East Queensland's…

New $25,000 litter program launched in Caboolture River

Explore News
A car tyre, election signs, chairs, fishing equipment, eskies and three large bags of rubbish were plucked from the Caboolture River during day one of a new waterway litter removal…

Get in touch

Healthy Land and Water is dedicated to the care of our unique and beautiful land, waterways and biodiversity.

  • Address: Level 19, 160 Ann Street Brisbane QLD 4000
  • PO Box: 13204, George Street Brisbane QLD 4003
  • Phone: (07) 3177 9100
  • Fax: (07) 3177 9190
  • Email:

We won't ever sell or rent your information. Read our Privacy Policy.
© Healthy Land and Water 2023