Mammals
Muskrat
Ondatra zibethicus · also called muskrats
Rising straight out of a cattail marsh, a dome-shaped muskrat lodge marks the centre of a small wetland world, one that dozens of other species, from wading birds to amphibians, have come to depend on because of the engineering work of a single rodent.
Overview
The muskrat, Ondatra zibethicus, is a semi-aquatic rodent native to wetland habitat across most of North America. Its distinctive lodge-building behaviour, laterally flattened swimming tail, and outsized role as a habitat engineer for marsh ecosystems make it one of the more ecologically significant small mammals found across the continent.
A small rodent with an outsized role in the marsh
Few animals reshape their own wetland habitat as directly as the muskrat, whose lodges, burrows, and feeding activity open up space and structure that countless other marsh species end up relying on.
Status
Least Concern, widespread and generally abundant across suitable wetland habitat throughout most of North America, though local populations can fluctuate considerably with water levels and disease.
Muskrat: common questions
Why is the muskrat considered an important species for wetland ecosystems?
By building dome-shaped lodges, digging burrows, and clearing patches of dense vegetation while feeding, this species creates open water and structural habitat that many other wetland birds, amphibians, and invertebrates come to rely on, making it a genuine habitat engineer within the marshes it inhabits.
How does the muskrat use its tail while swimming?
This species has a long, scaly tail flattened from side to side rather than top to bottom, which it uses as a rudder to help propel and steer itself efficiently while swimming through marsh water in search of food or shelter.
What does a muskrat's lodge look like?
A muskrat builds a dome-shaped lodge out of cattails, mud, and other marsh vegetation, piled up above the waterline with an entrance located underwater, a design that provides protection from predators and insulation during colder months.
What animals prey on muskrats?
This species serves as an important food source for a wide range of wetland predators, including mink, otters, hawks, owls, and large wading birds, making it a key link in the food web of the marsh habitat it helps to shape.