Dall's porpoises are highly acrobatic and are often seen swimming at high speed, darting to and fro, riding the bow waves of boats and engaging in slow rolls at the surface. Because they are black and white, boaters sometimes misidentify them as killer whales. Learn more about the Phocoenoides dalli, more commonly known as a Dall's Porpoise, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.