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In this file photo taken on June 27, 2018 a river dolphin (Sotalia fluviatilis) swims at Mamiraua Sustainable Development Reserve in Amazonas state, Brazil. Three Central American frog species have gone extinct and many others may soon follow as their populations are ravaged by a fungus spreading faster due to climate change, conservationists said on December 12, 2020. In an update to its “Red List” of threatened species, the International Union for Conservation of Nature (IUCN) said there had been some positive developments, including for the European bison, but warned the world was seeing a worrying number of extinctions. The tucuxi, a grey dolphin found in the Amazon river system, has been moved to the “endangered” category. (Photo by Mauro Pimentel/AFP Photo)
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