The Muskrat is a hairy philosopher with a moustache and long whiskers. He is very serious and prefers to spend time by himself. When Moominpappa builds a bridge by the river, he accidentally destroys the Muskrat’s home. As a result, he moves in with the Moomins. The Muskrat likes to spend time in the family’s hammock, reading his favourite book: The Uselessness of Everything. The worst thing he knows is to lose his dignity, which unfortunately happens all too often in the Moominhouse. Later, Muskrat moves into Sniff’s cave, where he is not disturbed by others.