2 - Dolphin
Have you ever wondered why dolphins and other cetaceans are the star attraction at most aquariums? It's because they're smarter than almost any other creature on the planet. Dolphins are extremely social animals. Schools of dolphins can be observed in the world's oceans surfing, racing, leaping, spinning, whistling and otherwise enjoying themselves. They also have a sophisticated "language," though humans have only begun to unravel it. Dolphins use tools in their natural environment and can learn an impressive array of behavioral commands by human trainers. Like many of the most intelligent animals on Earth, dolphin females remain with their young for several years, teaching them all the tricks of the dolphin trade.