Vultures rest in the tree’s upper branches, their black bodies in stark contrast to the blanched wood beneath their feet. Below them, caimans and capybaras crawl in sucking mud through the Agropil lagoon, seeking water that is unlikely to arrive for many months. The river has dried up, and there is nowhere for them to go.

The lagoon, located in the western Paraguayan province of Boquerón, is just one of many stretches of the Pilcomayo River suffering an extensive die-off of caiman, fish, and other river creatures. There have not been any official estimates from the Ministry of the Environment, but Roque González Vera, a journalist for ABC Color in Paraguay, reports utter devastation in some places: Up