River dolphins on the brink of extinction

Evolving to their habitat has made them blind,  & unlike their famous marine cousins, they do not jump and spin and frolic. Like superb divers, they leave no splash behind.

https://www.thehindu.com/sci-tech/energy-and-environment/less-than-a-dozen-indus-dolphins-remain-in-the-beas/article24531893.ece