![]() This likely serves as protection from leopards. However, while gorilla troops usually disband after the silverback dies, female eastern lowlands gorillas and their offspring have been recorded staying together until a new silverback transfers into the group. Joining a new group is likely to be a tactic against this. Without a silverback to protect them, the infants will likely fall victim to infanticide. In a single male group, when the silverback dies, the females and their offspring disperse and find a new troop. This behaviour has not been observed in eastern lowland gorillas. ![]() If the silverback dies, these males may be able to become dominant or mate with the females. However, male mountain gorillas sometimes stay in their natal troops and become subordinate to the silverback. Mature males also tend to leave their groups and establish their own troops by attracting emigrating females. Mountain gorillas and western lowland gorillas also commonly transfer to second new groups. For mountain gorillas, females disperse from their natal troops more than males. ![]() Both males and females tend to emigrate from their natal groups. Silverbacks have large canine teeth that also come with maturity. A silverback is typically more than 12 years of age, and is named for the distinctive patch of silver hair on his back, which comes with maturity. However, multiple-male troops also exist. Troops tend to be made of one adult male or silverback, with a harem of multiple adult females and their offspring. However, conservation efforts have been successful in some areas where they live. There are many threats to their survival, such as poaching, habitat destruction, and disease, which threaten the survival of the species. Both species are classified as Critically Endangered by the IUCN all subspecies are classified as Critically Endangered with the exception of the mountain gorilla, which is classified as Endangered. There are thought to be around 316,000 western gorillas in the wild, and 5,000 eastern gorillas. Lowland gorillas live in dense forests and lowland swamps and marshes as low as sea level, with western lowland gorillas living in Central West African countries and eastern lowland gorillas living in the Democratic Republic of the Congo near its border with Rwanda. The mountain gorilla inhabits the Albertine Rift montane cloud forests of the Virunga Volcanoes, ranging in altitude from 2200 to. Although their range covers a small percentage of Sub-Saharan Africa, gorillas cover a wide range of elevations. Gorillas' natural habitats cover tropical or subtropical forest in Sub-Saharan Africa. 1957), who is still alive at the advanced age of 65 years. Gorillas tend to live 35–40 years in the wild. The Eastern gorilla is distinguished from the Western by darker fur colour and some other minor morphological differences. They tend to live in troops, with the leader being called a silverback. Gorillas are the largest living primates, reaching heights between 1.25 and 1.8 metres, weights between 100 and 270 kg, and arm spans up to 2.6 metres, depending on species and sex. The DNA of gorillas is highly similar to that of humans, from 95 to 99% depending on what is included, and they are the next closest living relatives to humans after chimpanzees and bonobos. The genus Gorilla is divided into two species: the eastern gorilla and the western gorilla, and either four or five subspecies. Gorillas are herbivorous, predominantly ground-dwelling great apes that inhabit the tropical forests of equatorial Africa.
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