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BBC News By Helen Briggs image copyrightDian Fossey Gorilla Fund image captionIn chest beating, gorillas rise on to their hind legs and rapidly beat their chests with cupped hands The bigger a male gorilla, the better he is at beating his chest to signal to friends and foe just how powerful he is, scientists have confirmed. The impressive drumming sound is, as suspected, a measure of size and strength, a new study shows. Females tune into the patter of hands on chest when sizing up a mate, while males are warned off picking a fight. Researchers say it's a powerful means of communication in th...

Why do male gorillas beat their chests? New study offers intriguing evidence King Kong made the behavior famous, but scientists still know little about why the great apes perform this percussive display. ByJason Bittel Email But it may surprise you to learn that while scientists have speculated about the percussive display’s meanings, actual evidence for why male gorillas sometimes pound their chests has been scarce. “It is an extremely impressive display,” says Edward Wright, a primatologist at the Max Planck Institute for Evolutionary Anthropology in Germany . “It can be a bit frigh...

Gorillas don't lie: Chest beats provide reliable information about a male's size By (0) A male gorilla beats his chest, which researchers say conveys accurate body size information to competitors and potential mates -- but may have meanings beyond just size. Photo by Jordi Galbany/Dian Fossey Gorilla Fund A male gorilla beats his chest. Photo by Jordi Galbany / Dian Fossey Gorilla FundA male gorilla chest beating. Photo by Jordi Galbany / Dian Fossey Gorilla Fund April 8 (UPI) -- To calculate the size of a live gorilla, scientists must rely on an advanced imaging technique called photogramm...

They recorded the duration, number and frequency of 36 chest beats made by six of the males and linked them to measurements taken from photos of their shoulder width. The researchers from Germany, Spain and the US believe that the bigger males have larger air sacs near their larynx, making the drumming beat sound lower in pitch to the human ear. Gorillas are highly competitive in the search for a mate, with a single male living among a group of females. Different gorillas drummed more rapidly and for longer, which could allow them to be identified by sound through the dense tropical forest, a...

Gorillas do not bluff when they chest beat The gorilla chest beat is one of the most emblematic sounds in the animal kingdom, even working its way into our informal speech signifying overblown advertisement of one’s own achievements. However, until recently it was unclear what information gorillas were conveying when they gave these impressive displays. A team of international researchers show that chest beats reliably indicate the body size of the chest beater. Body size indicates competitive ability in gorillas. Therefore this information is likely to be crucial for rival males as well as...