Sukkur, PakistanIn a secluded pocket of Pakistan’s Lab-e-Mehran park, the smooth waters of the Indus River break into circular ripples, and the head of a pale gray dolphin appears. The animal lingers briefly before diving back into the water, its dorsal fin gleaming in the sun.

This quiet riverside park in the southern city of Sukkur, popular with families out for a stroll, is also home to the endangered Indus River dolphin, one of only four freshwater dolphin species left on Earth.

But a dam at the western end of the park restricts their ability to travel freely during the monsoon season, a crucial part of their life cycle.

It’s a similar story throughout Pakistan: Widespread construction of diversion