All river dolphins share many features which mark them as unusual among the dolphin family. They have an unusually long beak with many small teeth. They have a large, bulging forehead, and extremely large flippers. Overall, river dolphins are very small. Even the largest, the Boto, is only slightly longer than an adult human is tall. River Dolphins also have very tiny eyes, and are nearly blind -- in the muddy waters they inhabit, it wouldn’t do them much good to see, anyway.
