are river otters born live
North American river otters can live up to 21 years in captivity. They normally live about 8 to 9 years in the wild. North American river otters live alone or in family groups of, usually, females and their young. They are known as playful animals, often seen sliding in mud and snow and playing in the water.orth American river otters are semi-aquatic mammals, with long, streamlined bodies, thick tapered tails, and short legs. They have wide, rounded heads, small ears, and nostrils that can be closed underwater. Their whiskers are long and thick.