Animalia, April, Arvicolinae, Chordata, Cricetidae, Mammalia, Muroidea, North America, Ondatra zibethicus, Rodentia, US, USA, Wisconsin, adult, animal, cold, environment, feed, feeding, habitat, mammal, muskrat, natural, nature, north american, north woods, northern, northwoods, partially frozen, pond, rat, rodent, spring, spring time, springtime, vegetation, water, wetland, wild, wildlife