Amazon River Dolphin

The Amazon River Dolphin is most likely one of the most affected animals by the wave of droughts in the Amazon. This is because the rivers in the Amazon are becoming smaller when more droughts appear. So, I believe the Dolphins will evolve by becoming smaller alongside the rivers. They would do this because they would likely be too big for the rivers. Additionally, I believe the Dolphins would need to have migratory patterns to more coastal areas when droughts happen. This is because they can't survive well enough in the rivers of the Amazon during droughts.