A semi-aquatic, playful predator with a streamlined muscular body, glossy brown fur, short legs, webbed toes, long whiskers, and a long muscular tail. River Otters weigh between 6 and 31 lbs. They are powerful swimmers that can travel quickly on land and are often seen sliding down river banks into the water. Otters mainly eat fish and often swim in circles, creating a whirlpool-like motion that brings fish to the top of the water. Otters have been over-hunted for their highly-prized fur. Although efforts have been made to protect them, otters remain an endangered species in many states.