Why ocean dolphins would not be able to survive in the Amazon River?

Dolphins that live in the ocean would not be able to survive very well in the Amazon River. This is because dolphin’s bodies do not bend very well so it would be hard for them to bend around the branches. Out in the ocean as well as in captivity dolphins have a certain amount of wide open space in which to maneuver.

They do not need to worry about bending round corner or into narrow passageways. It would be very hard for a dolphin to survive in close quarters such as this and maneuver their bodies the way they would need to. Because of this dolphins would have to stay in a wide open environment that they have plenty of space to turn in so that they do not have to bend.