Fifty microphones captured a cacophony of sounds from Congo’s Nouabalé-Ndoki National Park
Chimpanzees frequently call as a group to announce their presence to other nearby groups, and, as in this case, older males sometimes pound on a tree buttress to embellish the sound.Listening for poaching activity allows anti-poaching teams to assess the effectiveness of their strategies, Wrege says. For example, during a three-month ranger training period in early 2018 when patrols were reduced while rangers were undergoing training, recordings of gunshots spiked.
Using recycled cell phones, White’s team detects sounds from trucks, motorcycles, chain saws, and gunshots in real time in 20 countries. Park rangers, scientists, anyone, for that matter, can access the recordings through the company’s website and app. Wrege’s audio “was like a goldmine,” he says. His team of scientists and interns had been scouring the internet for recordings of, inaudible to humans, that the animals sometimes use to communicate, when they came across Wrege’s recordings. Picking out those sounds was difficult—“it’s not even a needle in a haystack, it’s like an invisible hair,” White says—but after they identified one example, they were able to scan the database for hundreds of similar sounds.
France Dernières Nouvelles, France Actualités
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