The term WEB-FOOTED MAMMAL can be summarized as an otter, which is a five letter word. Otters are semi-aquatic mammals that live in both fresh and salt water habitats. They have webbed feet, which help them to swim quickly and efficiently. Otters also have thick fur to keep them warm in the water. They are known for their playful behavior and are often seen sliding down muddy banks or playing with rocks and sticks.