Chimpanzee Brain Facts

Order: Primates
Suborder: Haplorrhini
Family: Hominidae
Genus and species: Pan troglodytes
Subspecies: P. t. schweinfurthii, P. t. troglodytes, P. t. ellioti, P. t. verus

Conservation status: Endangered (IUCN Red List)
Life span: 40 to 45 years (wild), more than 60 (captive)
Total population: 172,700 to 299,700 (wild), 1,450 (captive)
Habitat range in the wild: Equatorial Africa, from southern Senegal across the forested belt north of the Congo River to western Uganda and western Tanzania
Gestation: 8 months (240 days)
Body height: 816 mm (M & F)
Body weight: 40 to 60 kg (M), 32 to 47 kg (F)
Brain weight: 384 g (0.85 lb)

Chimpanzees are one of our closest living relatives. They belong to the group called great apes, which also includes bonobos, gorillas, and orangutans. Humans and chimpanzees share a common ancestor from about 6–7 million years ago and have nearly 99% of their DNA in common. Studying chimpanzee brains helps scientists understand how the human brain evolved and what makes our species unique.

Chimpanzee brains are about one-third the size of human brains. Most of this difference comes from the neocortex — the outer layer of the brain that supports complex thinking. In humans, the neocortex is especially expanded in regions involved in planning, language, social understanding, and abstract reasoning.

Even though human brains are larger, chimpanzees show many impressive cognitive abilities. They use tools, cooperate in groups, recognize themselves in mirrors, remember past events, and learn from one another. These abilities are supported by brain systems that are organized in ways similar to our own.

Chimpanzee brains are highly folded. The folds increase the amount of surface area, allowing more neurons to fit inside the skull. Like humans, chimpanzees have distinct brain regions that specialize in different tasks, including movement, vision, memory, emotion, and social behavior.

Scientists have also discovered important similarities between chimpanzee and human brains:

• Chimpanzees have regions in the frontal and temporal lobes that correspond to human language areas, known as Broca’s area and Wernicke’s area. While chimpanzees do not use language the way humans do, these brain regions support communication through gestures, facial expressions, and vocalizations.
• They have specialized brain cells called von Economo neurons in areas involved in social awareness and emotional processing (anterior cingulate and frontoinsular cortex). These cells are found in humans and other great apes but not in most other mammals.
• The connections between different parts of the brain — especially pathways linking frontal and temporal regions — are more complex in chimpanzees than in monkeys, helping support advanced social and learning abilities.

Because chimpanzees age in ways that are biologically similar to humans, their brains also help scientists study healthy aging and brain diseases. Research on chimpanzee brain structure, development, and aging provides valuable insight into the evolution of intelligence, social behavior, and brain health.

By comparing chimpanzee and human brains, scientists gain a clearer picture of both our shared heritage and the changes that shaped the human mind.

Comparison of human and chimpanzee brain size growth

Source: Robson SL, Wood B (2008) Hominin life history: reconstruction and evolution.  J Anat. 212: 394-425.