Strength, Height, Lifespan, Size & Bite Force - Silverback Gorillas

Facts about Silverback Gorillas

January 10, 2026 6 20

Silverback Gorillas are the largest primates on earth. After bonobos and chimpanzees, gorillas are the closest relatives to humans. In fact, their DNA structure is about 98% similar to that of humans. Gorilla are only found in the great forests of East, Central and Western Africa. They are dived into two main species – The eastern gorilla and the western gorilla.

The western gorilla is divided into two subspecies – The western lowland gorilla and the Cross river gorilla. Eastern gorillas include the Mountain gorilla and the Eastern Lowland Gorilla (Also known as Grauers Gorilla). Of all the gorilla subspecies, the Eastern Lowland gorilla is the largest, followed by the mountain gorilla. The Cross River gorilla is the smallest of the lot.

There are currently over 300,000 Western lowland gorillas, about 5000 Eastern lowland gorillas, slightly over 1,000 mountain gorillas and less than 400 Cross river gorillas. All subspecies of gorillas are considered critically endangered by the International Union for Conservation of Nature (IUCN). This is because their numbers have reduced considerably in the last century. The main cause of this decline is human diseases, habitat destruction and poaching for meat.

Silverback Gorilla – Size, height and lifespan

Gorillas live in groups or families led by a Silverback. Silverback doesn’t refer to a particular species of gorillas but a mature male gorilla. Silverback gorillas are distinguished by a grayish white hairline around the back and shoulders. A male gorilla that is too old to be a juvenile but too young to be a

Gorillas live in groups or families led by a Silverback. Silverback doesn’t refer to a particular gorilla specie but a mature male gorilla. Silverback gorillas are distinguished by a greyish white hairline around the back and shoulders. A male gorilla that is too old to be a juvenile but too young to be a silverback is referred to as a blackback. A silverback gorilla is much larger than a female. Compared to a female, a silverback gorilla has a larger head, body and can weigh up to 270 kilograms. A male gorilla becomes an adult at about 8 years of age. This is the time most leave the group to stay alone or join other lone males. When leaving a group, a male gorilla is often not fully mature and are generally still referred to as Blackbacks. It is only when they become fully grown (at about 12 to 13 years of age) that they become silverbacks. This is also the time when the hair down their back and across the shoulders becomes whitish or greyish in colour.

A lone blackback or mature silverback will live close to a particular group and attempt to dethrone the dominant silverback as soon as he feels strong enough. If he fails to dethrone a leader of a particular gorilla family, he will try to steal females from that group to form his own. His success in doing so will depend on the degree of loyalty the females show to the targeted silverback.

It is important to note that some males never leave their original group on reaching maturity. They will stay loyal to the dominant silverback and help protect the group from intruders. This arrangement is more common with mountain gorillas and rare with Western lowland gorillas.

Whereas it is possible to find several silverback gorillas in a group, there is always only one dominant one. The dominant silverback is the leader of the group and has absolute authority. He dictates what is to be done and when. He determines when to eat, rest and is entitled to mate with all the females in the group. Gorilla mating is often initiated by the female upon reaching maturity. The dominant silverback controls a group containing between 5 to 35 individuals. A gorilla group contains several females, adolescents/juveniles, infants and some adult males. Females leave the group upon reaching maturity to avoid mating with the father.

Strength of a silverback gorilla

A mature silverback gorilla is about twice the weight of an adult male. They are over 9 times stronger than an adult male. Their incredible strength is not just because of their body weight but mainly because of muscle mass. Would a strong adult male have a chance against a silverback in a duel? Whereas no fight has been recorded between an adult male and a silverback gorilla, it is obvious who the winner will be. An angry silverback would beat a mature man to a pulp because of its incredible power. That said, silverback gorillas are not aggressive unless threatened.

Are silverback gorillas aggressive?

The dominant silverback gorilla leads by charisma and example. He is always peaceful and rarely uses force. A silverback gorilla only becomes aggressive when it encounters a threat, intruders or if he wants to assert dominance. Intruders can mean males from other groups, stubborn members of his group,

The dominant silverback gorilla leads by example and charisma. He is always peaceful and rarely uses force. A silverback gorilla only becomes aggressive when it encounters a threat, intruders or if he wants to assert dominance. Intruders can mean males from other groups, stubborn members of his group, animals like leopards or humans visiting a group that is not fully habituated. When a silverback gorilla recognizes a threat or a silverback from another group, he will first send a warning to the intruder. He does this by standing up while drumming up his chest.

If the above warning doesn’t work, he will tear up and throw plants at the intruder while making a deafening sound. The silverback will then try a mock attack using all four legs. If all initial actions don’t work and the intruder hasn’t yet got the message, the silverback will make a direct attack. His strategy is to deliver a powerful blow with the hands or teeth. When the threat proves real, a silverback gorilla will defend his group and especially infants to the death. It is one reason why poachers and pet traders focus on killing the silverback gorilla to have any chance of success in capturing an infant.

What do silverback gorillas eat?

The diet of a Silverback gorilla consists of mainly fruits, shoots and leaves. They also love termites, ants and certain insects. Mountain gorilla diet is slightly different. It consists of mainly stems and leaves. They may also feed on fungi, flowers and bark. In general, mountain gorillas live a life of plenty because they are exposed to a greater variety of vegetation than the other gorilla sub-species. For all gorilla sub-species, the kind of food eaten depends on whether it’s a rainy or dry season. These seasons determines which kind of food is prevalent. Isn’t it odd that such massive and strong creatures do not eat meat?

Where to see silverback gorillas

Where are silverback gorillas found?  Silverback gorillas are found in the dense forests of East, Central and Western Africa. Lowland gorillas can be sighted in forests and swamps along the Congo river basin. Mountain Gorillas are mostly found in the wider Virunga conservation region and Bwindi Impenetrable forest. In general, if you want to see wild eastern lowland gorillas, you have to visit Maiko National Park, Kahuzi-Biega National Park, Tayna Gorilla Reserve, the Itombwe Massif and the Usala forest.

Western lowland gorillas are more widespread and found in Gabon, Democratic Republic of Congo, Angola, Central African Republic, Cameroon, Equatorial Guinea and Republic of the Congo. Mountain gorillas live in Mgahinga National Park in Uganda, Bwindi National Park in Uganda, the Volcanoes National Park in Rwanda and Virunga National Park in Congo.

How to see silverback gorillas in Africa?

In order to see silverback gorillas in the wild (also known as gorilla trekking), you have to prepare to visit Africa. There are no shortcuts. There are many Travel Agencies which offer amazing tours to visit Silverback gorillas. You must be prepared to acquire a gorilla permit and also plan for other costs of gorilla trekking like transport, accommodation and meals. You might want to read about gorilla trekking for the elderly if you are a senior. The best places to see gorillas are in Bwindi National Park, Mgahinga Gorilla National Park, Volcanoes National Park, Virunga National Park and Kahuzi-Biega National Park. Wild Western Lowland Gorillas live in extremely remote and sometimes volatile regions of West Africa. Thank you for taking your time to read this far.