The lifespan of these gorillas is between 40 and 50 years. These gorillas are intelligent and communicate with 25 different noises.The gorillas beat their chest to create an emanating drumming sound to attract females and intimidate rival males.Adult males rule over a single territory, often fighting to gain control over an area or a female.If that isn’t enough, he will charge at the perceived threat. To defend his family, a male silverback will beat his chest as a warning.A dominant silverback male is the head of the family and protects the females and the infants. Eastern gorillas live in stable, cohesive family groups of up to 35 members.They are semi-terrestrial species that do not always live on land, spending a lot of time on treetops.At night, they stay in their nests that are built by folding over vegetation on the ground. Foraging mostly occurs in the morning and late afternoon. They spend 40% of the day resting, 30% on feeding-related tasks, and the remaining 30% traveling. Sometimes they eat flowers, bark, roots, and small invertebrates. They also eat fruits if they are available in the area they inhabit. DietĮastern gorillas are herbivores, and they follow a foliage-based diet. They sleep in nests that are built on treetops. They reside in mountain rainforests, dense montane forests, subalpine forests, and sometimes in swamplands if the proper vegetation grows. Because of their silver saddle, older males are often called silverbacks. They have a silvery saddle on their back, which becomes white as the gorilla ages. Also, a male eastern gorilla can be identified by his sharp and large canine teeth. Sexual dimorphism exists in this species as males tend to be bigger than females. The arms of the eastern gorilla are about 15% longer than their legs. Like other gorillas, a strong smell emits from the apocrine glands in their armpits when they are under stress. The long arms end in hairless hands and fingers, of which the thumbs are larger than the other digits. The face of an eastern gorilla includes ridges above their eyes, a flat nose with enlarged nostrils, small ears, and larger jaws compared to other gorilla species. When they are 12, the fur on the male’s back changes from black to grey.Ĭompared to the rest of their bodies, they have large heads covered with fur – except for their completely bald faces. Mountain gorillas are smaller and lighter than eastern lowland gorillas. Body and Coloration: Eastern lowland gorillas have a thick layer of deep black fur, while eastern mountain gorillas have bluish fur.
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