Rat, Ondatra zibethicus
The Musk Rat is the largest
species of vole and is found in lakes and slow flowing rivers
with dense cover on the banks. The long tail and webbing between
the hind toes assist in swimming. In marshes Musk Rats build
conical lodges of twigs. They feed on aquatic plants and
invertebrates, such as molluscs.
Link to Musk Rat Skull