In addition to their fur, river otters also have a number of other adaptations that help them to camouflage themselves. Their eyes are located on the top of their heads, which gives them a wide field of vision and helps them to spot predators. Their ears are small and rounded, which helps to minimize drag in the water. Their tails are long and muscular, and they use them to help them swim and steer in the water.
All of these adaptations make river otters very well-suited for their aquatic lifestyle. They are able to move through the water quickly and easily, and they are able to avoid predators and find food. Their camouflage also helps them to blend in with their surroundings, which makes them less likely to be seen by predators.