River otters not only drink water but spend most of their everyday life and time in the water. Many of their food sources come from the water but mostly the river otters eat fish. They eat all different kinds of fish.
River otters are brown and black. The adults are three to four feet long, including their 12 to 18 inch tail. The tail is flat and well muscled. They generally weigh 15 to 25 pounds. The males are usually larger than the females. The river otter's body is elongated. It has small ears. Its ears and nose close when it goes under the water. Its eyes are located near the top of its head, so it can see above the surface while it is swimming nearly submerged. The river otter's legs are short, with five webbed toes on each
foot. It has tightly packed underfur, and its long guard hairs are water-repellent. It has teeth like a carnivore. The otter's sense of smell is very good, but its senses of sight and hearing are not as well developed.