Thoreau’s Journal December 19th, 1854

Near the island I saw a muskrat close by swimming in an open reach. He was always headed up-stream, a great proportion of the head out of water, and his whole length visible, though the root of the tail is about level with the water. Now and then he [stopped] swimming and floated down-stream, still keeping his head pointed up with his tail. It is surprising how dry he looks, as if that back was never immersed in the water.