The BBC reports that their film crew discovered something miraculous while searching for the endangered frog in South America: he waves to his mates and foes. Yep, the river is so loud near his habitat in Panama, that scientists think the frog evolved the skill to better communicate. Unfortunately the frogs were all taken after filming to save them from a fungus that has spread over much of the forest.

The frogs (Atelopus zeteki) were filmed at a remote location in the Panamanian rainforest. The population had all but disappeared because of a fungus that grows on the amphibians’ skin and suffocates them.