Social mingling shapes how orangutans issue warning calls
“Kiss-squeaks” among red apes provide a peek into how social scenes mold vocal variety
![photo of an orangutan looking directly at the camera through trees](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/03/032422_bb_orangutan-vocalizations_feat.jpg?fit=1030%2C578&ssl=1)
Orangutans (one pictured) expand their repertoire of predator-warning calls in low-density populations, researchers say.
Adriano Lameira