成人快手

Scientists have discovered that orangutans use their hands to alter their voices and make themselves sound bigger. The animals cup their mouths when they produce kiss squeaks - alarm calls that often signify a predator is nearby. Researchers have now studied the acoustics of these "hand-modified kiss squeaks" and shown that the animals sound bigger when they use their hands in the call. Adriano Lameria is from the University of Durham and has been researching orangutan calls.

(Photo: Orangutan swinging on a tree trunk swing. Credit: 成人快手)