The drumming noise generated by them is their way to convey how big they are and to show their identity. The study also shows that larger gorillas make deeper noise while beating their chest when compared to the small ones and the pattern of chest-thumping is distinct for each one of them.
The idea behind beating their chest by these gorillas is to prove dominance over other males, while trying to impress the female counterparts. For the study, the researchers analyzed video of 25 male gorillas from Volcanoes National Park, Rwanda. The exact body size of these creatures was calculated by measuring the distance between their blades and shoulders.
A systematic data that recorded the number of beats and the beat rate was then arranged according to the size and age of the gorillas. Epic floods leave South Sudanese to face disease and starvation.
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Magazine How one image captures 21 hours of a volcanic eruption. Although intense contact aggression between males is infrequent, rival males use the information to determine the competitive ability of the chest beater and whether to initiate, escalate or retreat from aggressive behaviors with the other. Not surprisingly, females most likely use the sound to determine whether this is a good candidate for a mate. Because gorillas live in predominantly one-male, multifemale social groups there's high male-to-male competition.
Females, however, are not locked into one group and may wander among social groups, thereby presenting females with the option to choose mates. The researchers also found a lot of variation among males in both the number and duration of the chest beats, suggesting that like human fingerprints, they may have individual signatures. However, more research is needed to confirm that theory. Not as common as movies portray, silverbacks chest beat relatively infrequently, on average 0.
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