The body size of gorillas is conveyed in the soundsĭespite the symbolic value of the gorillasʼ chest beats, communication studies focused on the vocalizations of these apes. These present a sexual dimorphism -males weight twice the weight of females- and in general, females move across groups to choose the one they prefer depending on the malesʼ features. ![]() Mountain gorillas live in social groups with one or more males that show a high competition towards the other males in the group and neighbouring groups. This habitat, which is quite reduced, is known thanks to the research and conservationist work the prestigious primatologist Dian Fossey started, and which is still ongoing by the homonymous Foundation. The study focused on the analysis of ten social groups of gorilla mountains in the Volcanoes National Park of Rwanda. This subspecies is listed as endangered by the International Union for Conservation of Nature (IUCN), and it is estimated that only about a thousand of them are in the Bwindi Impenetrable Forest National Park (Uganda) and the Virunga Mountains, a chain of mountains between the Democratic Republic of the Congo, Uganda and Rwanda. The mountain gorilla ( Gorilla beringei beringei ) is one of the great African apes that lives in the volcanic hillsides in the Albertine Rift, in eastern Africa. Among the participants in the study are the researchers from the Dian Fossey Gorilla Fund (United States), the George Washington University (United States) and the Goethe University Frankfurt (Germany). This international study has been published in the journal Scientific Reports and is led by Edward Wright and Martha Robbins, from the Max Plank Institute for Evolutionary Anthropology (Germany). According to the experts, this visual and acoustic signal indicates the body size of gorillas to their social group -males and females- as well as to other neighbouring gorilla groups. ![]() The biggest and most competitive male gorillas make lower frequency beats (deeper sounds). A research team in which Jordi Galbany, expert from the Faculty of Psychology of the UB, takes part, has found a correlation between the body size of gorillas and the sound frequency of the typical chest beats.
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