Haichangs Dolphin Theatre has a water curtain show, and the effect is good. Dolphin is an aquatic mammal closely related to whales and porpoises. It evolved about 10 million years ago in the Miocene. It lives extensively in the shallow sea near the continental shelf and is occasionally seen in fresh water. It mainly feeds on fish and mollusks. All kinds of dolphins constitute the dolphins family, which is the most diverse species of marine mammals. There are 17 genera and 37 species in the world, and 13 genera and 18 species in China. Dolphins have a seemingly friendly form and a playful character that have always been popular in human culture. The Undersea World Pavilion has a subsea tunnel. There are some science exhibitions that you can watch.