Yamila Barasch, Natalia Rodríguez and Stephanie Simioni decant a river water sample into a collection bottle aboard the expedition’s dinghy on the Paraguay River, between Corumbá and Porto Morrinho, Mato Grosso do Sul, Brazil, 29 August 2026, one of two samples taken on the expedition’s first day. Photographed during the Paraguay River Expedition, a Jaguar Rivers Initiative survey running downstream from Corumbá, Brazil, into Paraguay and Argentina. The initiative is an alliance of Rewilding Argentina, Fundación Moisés Bertoni (Paraguay), Nativa (Bolivia) and Onçafari (Brazil). Photographed by Henry Maillet with support from the National Geographic Society.