This document discusses different types of dolphins. It notes that there are 36 types of ocean dolphins and 5 river dolphins. Some types include bottlenose, spotted, striped, and pink river dolphins. Pink river dolphins have a larger brain than humans and live in the Amazon. They can turn 180 degrees and have a hump instead of a dorsal fin. The document also provides facts about dolphin behaviors, such as that they can swim up to 260 miles per day, sleep with half their brain awake, and use echolocation to find food.