Krasimir Kirov, curator in the "Nature" department at the Regional History Museum Ruse, examines a bone in the dried-out Danube riverbed near the village of Ryahovo on August 21, 2026, during an organised fossil hunt after a record low water level revealed mammoth bones there at the end of July. (Photo by Dimitar KYOSEMARLIEV / AFP via Getty Images)

People walk along the dried river bed of the Danube River near the city of Ruse on August 21, 2026. The Danube -- which runs from the Black Forest mountains of western Germany through 10 countries to the Black Sea -- has dropped to record low levels in parts due to prolonged rain shortages and successive heatwaves since May 2026. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)

This aerial photograph shows excavators digging sand from the bottom of a dried-up branch of the Danube River near the city of Ruse, on August 21, 2026. The Danube -- which runs from the Black Forest mountains of western Germany through 10 countries to the Black Sea -- has dropped to record low levels in parts due to prolonged rain shortages and successive heatwaves since May 2026. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)

People walk along the dried river bed of the Danube River near the city of Ruse on August 21, 2026. The Danube -- which runs from the Black Forest mountains of western Germany through 10 countries to the Black Sea -- has dropped to record low levels in parts due to prolonged rain shortages and successive heatwaves since May 2026. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)

People walk along the dried river bed of the Danube River near the city of Ruse on August 21, 2026. The Danube -- which runs from the Black Forest mountains of western Germany through 10 countries to the Black Sea -- has dropped to record low levels in parts due to prolonged rain shortages and successive heatwaves since May 2026. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)

People walk along the dried river bed of the Danube River near the city of Ruse on August 21, 2026. The Danube -- which runs from the Black Forest mountains of western Germany through 10 countries to the Black Sea -- has dropped to record low levels in parts due to prolonged rain shortages and successive heatwaves since May 2026. (Photo by Nikolay DOYCHINOV / AFP via Getty Images)

TOPSHOT - People eat food next to robots at the 2026 World Robot Conference in Beijing on August 20, 2026. (Photo by Adek BERRY / AFP via Getty Images)

TOPSHOT - A child-size of the Noetix Bumi robots are pictured during the 2026 World Robot Conference in Beijing on August 20, 2026. (Photo by ADEK BERRY / AFP via Getty Images)