The Amazon River Dolphins can be divided into four groups. The specific name of these dolphins is Inia geoffrensis. They can be found at freshwater around Brazil, Bolivia, Peru, Ecuador and Colombia. They are able to turn their necks at 180 degrees. The Amazon River Dolphin has about 100 peg-like front teeth for catching prey and it eats crabs, turtles, catfish and other fish. They are also qualified as endangered animals. The pink Amazon River Dolphins are bigger than the grey Amazon River Dolphins. The brain of the river dolphin is 40% bigger than human’s brain.