They are also shy. It eats mainly fish, but also crustaceans, mollusks, amphibians, reptiles, birds, and mammals. The fish they eat are sometimes rough fish. Nothing eats it usually, but people kill them. River otters are found in lakes, and the larger streams.
Most otters make their dens close to water under tree roots, rocks piles, logs, or thickets.
A typical den is a hole leading into a bank, with the entrance below water level. The River otter is currently on the endangered list. Heavy demand for the Otter's fur is leading to trapping.