The European otter (Lutra lutra), also known as the Eurasian otter, Eurasian river otter, common otter, and Old World otter, is a European and Asian member of the Lutrinae or otter subfamily, and is typical of freshwater otters. It is the most widely distributed otter species, has a diet mainly of fish, and is strongly territorial. It is endangered in parts of its range, but recovering in others.