Dolphins are definitely smart but there is much debate over intelligence tests.
Dolphins and porpoises are found in every ocean of the world. From the deep Antarctic Ocean, to South Pacific lagoons, and the bays and fjords of British Columbia's coastline. There are five river dolphin species found in five different rivers. Hector's dolphins of the New Zealand coastal waters feed on schooling yellow-eyed mullet and red cod from the ocean floor. Bottlenose dolphins feed on small fishes, eels, catfishes, mullet, squids and shrimps.