Gorillas at the Atlanta Zoo have learned a new call to keepers.

This means that these primates have the ability for complex vocal learning. The new sound is like a cross between a cough and a sneeze and is equivalent to a human "ahem". In English, it was called snough - sneeze ("sneeze") + cough ("cough"). Gorillas use this sound to get food and attention from humans. Experiments have confirmed that the call is used purposefully. Analysis of the sound showed that it differed acoustically from standard gorilla audio signals.