There are 32 known species of dolphins. The bottle-nosed dolphin is often the species used in aquatic shows. The common dolphin inspired many Mediterranean folk lores. Both of the dolphins above appear in open waters, usually around cruise ships. They like to show off around the boat.
There are also freshwater dolphins that live in rivers of Asia and South America. The Buffeo dolphin has been spotted up to 1250 miles up he Amazon River. The buffeo is the smallest of all dolphins averaging about 4 feet. The bottlenose is closer to 10 feet. The killer whale, which is also considered a dolphin, can grow to be 30 feet long. The pilot whale is also considered a dolphin.