The aquatic environments in southern Brazil provide shelter and resources for a large number of species, among them the marsh rat, a large rodent with the scientific name Myocastor coypus.
It is considered a semi-aquatic animal, living on the banks of rivers, lakes, and swamps, always associated with water. An excellent swimmer, it can remain submerged for up to 5 minutes, and its paws have interdigital membranes that facilitate movement.
The body generally measures between 43 and 63 centimeters, and the tail can exceed 1 meter in length. Its weight ranges from 4 to 8 kilos, and there are records of individuals weighing up to 10 kilos. Its coat coloring is predominantly black and grayish-yellow.
Besides the south of Brazil, it is found naturally in Chile and Argentina. It was domesticated worldwide mainly for its fur. Due to escapes and releases there are established wild populations in North America and Europe.
They feed on grasses, aquatic plants, snails, mussels, and small fish. They are sociable animals, living in colonies. They reproduce on average 3 times a year, with litters of up to 7 pups, which become independent from their mothers after 2 months.
In our Unit in Estância Velha/RS we often find this species grazing on the grass or swimming peacefully. Tell us if you have seen this species.
