But why do they do that? To find out, biologists from Germany, Spain and the United States studied mountain gorillas (gorilla bengi benji) found in the dense mountain forests of Central Africa.
After a detailed and careful observation, the experts came to know two important things:
Male gorillas tell other male gorillas about their size (height) by beating their breasts in a certain way. Surprisingly, the short-tailed gorillas beat their breasts more intensely, while the larger, taller and stronger-bodied gorillas had significantly lower heart rate.
When the female guerrilla hears the male guerrilla's chest throbbing, she decides whether or not the male will harmonize with the guerrilla for reproduction. Female gorillas usually have large and strong-bodied gorillas as their "partners", while smaller and weaker gorillas have difficulty finding, mating, and breeding.
Because mountain gorillas live in dense forests where their population is very small and scattered, the sound of their chests beating also acts as a means of communication between these gorillas.
Details of the study are published in the latest issue of the online research journal "Scientific Reports".
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