Eurasian otters (Lutra lutra) have a dense, double-coated fur. Their fur is dark brown on top, with a lighter brown underbelly. In the water, they can appear almost black. They have a typical mustelid shape, featuring short legs and a muscular body. Their noses and eyes can be either brown or black, and they possess small rounded eyes and webbed feet. One of their notable features is their long whiskers. In summary, Eurasian otters are perfectly adapted to live and hunt in their natural habitat.