Otters are a type of furry fish eater. They are semi-aquatic mammals that live in rivers, lakes, and coastal areas. They have long, slim bodies with short legs, webbed feet, and a thick fur coat. Otters are known for their playful behavior and are often seen sliding down muddy banks or playing with rocks and sticks. They feed mainly on fish, but also eat crustaceans, frogs, and other aquatic animals.