Eastern Chimpanzee: The Endangered Great Ape of Africa

   The Eastern chimpanzee is a subspecies of the common chimpanzee, one of the closest living relatives of humans. These intelligent and social primates are endemic to the forests of Central and East Africa and have been studied extensively by primatologists for decades. Unfortunately, their numbers are declining rapidly due to habitat loss, hunting, and diseases, and they are now classified as Endangered by the International Union for Conservation of Nature (IUCN). In this article, we will explore the scientific name and classification, history, evolution, physical description, social structure, distribution and habitat, population, behavior and lifestyle, reproduction, diet, predators, relationship with humans, fun facts, and FAQs of the Eastern chimpanzee.

Scientific Name and Classification:

  The Eastern chimpanzee (Pan troglodytes schweinfurthii) is one of four subspecies of the common chimpanzee (Pan troglodytes), along with the Central chimpanzee (P. t. troglodytes), the Nigerian-Cameroonian chimpanzee (P. t. ellioti), and the Western chimpanzee (P. t. verus). The common chimpanzee is a member of the Hominidae family, which also includes humans, gorillas, and orangutans.


  Chimpanzees have been known to humans for centuries, but the first scientific descriptions of them were made in the 18th century by European explorers. The Eastern chimpanzee was named after the German explorer Georg Schweinfurth, who first described the subspecies in 1870. Since then, many famous primatologists, including Jane Goodall, have studied Eastern chimpanzees and contributed greatly to our understanding of their behavior and ecology.

Evolution and Origins:

  Chimpanzees and humans share a common ancestor that lived about 6-7 million years ago. Chimpanzees diverged from the human lineage about 4-5 million years ago and have since evolved to become one of the most intelligent and adaptable primates on Earth. Eastern chimpanzees are thought to have evolved in the forests of Central and East Africa, where they still occur today.

Physical Description:

  Eastern chimpanzees are large and robust primates, with males being larger than females. They have black hair covering their entire body, except for their faces, hands, and feet, which are usually hairless. Their faces are flat and broad, with protruding eyebrows and a pinkish or brownish skin tone. They have opposable thumbs and toes that allow them to grasp and manipulate objects, and their arms are longer than their legs, making them excellent climbers.

Social Structure:

  Eastern chimpanzees are highly social animals that live in large groups or communities, called communities or troops. Each community can comprise up to 150 individuals, but the average size is around 50-80. The community is usually led by a dominant male, who is responsible for protecting the group and mating with the females. Females have a hierarchical social structure and form strong bonds with each other and their offspring. Eastern chimpanzees communicate using a variety of vocalizations, facial expressions, and body postures, and they have been observed using tools and solving complex problems.

Anatomy and Appearance:

  Eastern chimpanzees have a distinctive appearance, with a robust and muscular build and long, coarse hair that covers their entire body. They have broad faces with protruding eyebrows and a prominent jaw, which gives them a unique facial expression. Their hands and feet are specially adapted for climbing and grasping, with opposable thumbs and toes and a highly sensitive sense of touch. Eastern chimpanzees have large brains relative to their body size, which is thought to be responsible for their advanced cognitive abilities and social complexity.

Distribution and Habitat:

  Eastern chimpanzees are found in Central and East Africa, including the Democratic Republic of Congo, Uganda, Rwanda, Burundi, Tanzania, and Zambia. They inhabit dense tropical forests, woodland savannas, and montane forests, usually at elevations between 500 and 3,000 meters. However, their habitat is rapidly declining due to human activities such as deforestation, mining, and agriculture.

Population – How Many Are Left?

  The Eastern chimpanzee population is declining rapidly, and the IUCN estimates that there are only about 5,000 to 6,000 individuals left in the wild. Their population has declined by at least 50% over the past 30 years due to habitat loss and fragmentation, hunting for bushmeat, and disease outbreaks such as Ebola.

Size and Weight:

  Eastern chimpanzees are among the largest primates, with males weighing between 40 to 60 kilograms (88 to 132 pounds) and females weighing between 27 to 50 kilograms (60 to 110 pounds). They can reach a height of up to 1.3 meters (4.3 feet) when standing upright.

Behavior and Lifestyle:

  Eastern chimpanzees are diurnal animals, meaning they are active during the day and rest at night. They spend most of their time foraging for food, socializing with other group members, and grooming each other. They communicate with a variety of vocalizations, including grunts, screams, and pant-hoots, and they use facial expressions and body postures to convey emotions and intentions. Eastern chimpanzees are known for their intelligence and tool-use, which includes using sticks to probe for insects or to fish for termites.

Reproduction, Babies, and Lifespan:

  Eastern chimpanzees have a polygamous mating system, with dominant males mating with multiple females. Females reach sexual maturity at around 10 to 12 years of age, while males become sexually mature at around 15 years of age. Gestation lasts about 8 months, and females give birth to a single offspring. The mother is responsible for raising and nursing the baby for several years, and the infant will stay with the mother for up to 8 years before reaching independence. Eastern chimpanzees have a lifespan of up to 40 to 50 years in the wild.

Diet and Prey:

  Eastern chimpanzees are omnivorous and eat a variety of foods, including fruits, leaves, flowers, seeds, insects, and small mammals. They have a diverse and adaptable diet, and their food choices vary depending on the season and availability. They have also been observed using tools, such as sticks or stones, to extract food or crack open nuts.

Predators and Threats:

  Eastern chimpanzees are apex predators, meaning they have no natural predators except for humans. The primary threats to their survival are habitat loss and fragmentation, hunting for bushmeat, and disease outbreaks such as Ebola. They are also at risk from poaching for their body parts, which are used in traditional medicine and as trophies.

Relationship with Humans:

  Eastern chimpanzees have a complex relationship with humans. On the one hand, they are revered in many African cultures as totems or spiritual beings. On the other hand, they are hunted for bushmeat, captured for the pet trade, and their habitat is rapidly declining due to human activities such as deforestation and agriculture. Conservation efforts are underway to protect their remaining habitat and reduce hunting and poaching.

Incredible Facts!

  • Eastern chimpanzees are one of the closest living relatives of humans, sharing about 98% of our DNA.
  • They are highly intelligent and have been observed using tools, solving complex problems, and even exhibiting behaviors such as mourning the loss of their group members.
  • Eastern chimpanzees have a complex social structure, with dominance hierarchies, alliances, and even cultural differences between different groups.
  • They are capable of recognizing themselves in mirrors, a trait that is rare among animals and is considered a sign of self-awareness.
  • In some African cultures, Eastern chimpanzees are believed to have supernatural powers and are revered as sacred animals.


  • Eastern chimpanzees are excellent climbers and spend most of their time in trees.
  • They have opposable thumbs and can use their hands and feet to grasp and manipulate objects.
  • Eastern chimpanzees have a wide variety of facial expressions, including smiles, frowns, and pouts, which they use to communicate with other group members.
  • They have been observed using leaves as makeshift toilet paper, a behavior that is rare among animals.

FAQs (Frequently Asked Questions):

  • Q: Are Eastern chimpanzees endangered?
  • A: Yes, Eastern chimpanzees are listed as Endangered by the IUCN, with only about 5,000 to 6,000 individuals left in the wild.

  • Q: Are Eastern chimpanzees aggressive?
  • A: While they can be aggressive in certain situations, such as when defending their territory or offspring, Eastern chimpanzees are generally peaceful and social animals.

  • Q: Can Eastern chimpanzees swim?
  • A: While they are not adapted for swimming, Eastern chimpanzees have been observed wading through shallow water or crossing rivers by holding onto branches or using natural rafts.

  • Q: Can Eastern chimpanzees be kept as pets?
  • A: No, keeping Eastern chimpanzees as pets is illegal in most countries and is highly unethical. It is also dangerous, as they can become aggressive and unpredictable when they reach maturity.


  Eastern chimpanzees are fascinating and complex animals that are among our closest living relatives. Their advanced cognitive abilities, social complexity, and tool-use have made them the subject of much research and admiration. However, their habitat is rapidly declining, and they are facing numerous threats to their survival. Conservation efforts are crucial to protect their remaining habitat and reduce hunting and poaching, and to ensure that future generations can continue to appreciate these incredible animals.

  In conclusion, Eastern chimpanzees are a vital species that deserve our attention and protection. Through their complex social structures, advanced cognitive abilities, and unique behaviors, they offer us a glimpse into the rich diversity of life on our planet. However, their habitat is rapidly disappearing, and they face numerous threats from human activities. Conservation efforts must be intensified to ensure that they can continue to thrive in the wild. By protecting their habitat, reducing hunting and poaching, and promoting sustainable development, we can ensure that Eastern chimpanzees have a secure future. In doing so, we also contribute to the preservation of our natural world and the ecosystems that sustain us all.

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