Chimpanzees are endlessly studied and endlessly surprising. Here are 50 facts that show just how close — and how remarkable — our nearest living relatives really are.
Biology and genetics
- Chimpanzees share around 98–99% of their DNA with humans, making them our closest living relatives.
- Adult male chimpanzees typically weigh 40–70kg; females are somewhat smaller.
- Chimpanzees can live 33–45 years in the wild, and into their 50s or 60s in captivity.
- Chimpanzees have opposable thumbs and big toes, giving them dexterous hands and feet.
- A chimpanzee's arm span is longer than its height, an adaptation for swinging through trees.
- Chimpanzees are covered in coarse black hair, but like humans, they can go visibly grey with age.
- Wild chimpanzees are found across more than 20 countries in West and Central Africa.
- Chimpanzees and bonobos are the two species in the genus Pan — chimpanzees' closest relative besides humans.
Intelligence and tool use
- Chimpanzees use more tools, in more contexts, than any animal other than humans.
- They fashion "fishing sticks" from twigs to extract termites and ants from mounds.
- Some populations use stone or wooden hammers and anvils to crack open hard-shelled nuts.
- Chimpanzees have been observed using leaves as sponges to soak up water for drinking.
- They can recognise themselves in a mirror — a rare sign of self-awareness in the animal kingdom.
- Chimpanzees can learn and use symbols and simple sign language in controlled studies.
- Young chimpanzees learn tool use by watching and copying adults — true cultural transmission.
- Different chimpanzee communities have distinct "tool kits" and behaviours passed down locally, much like human regional traditions.
Social life
- Chimpanzees live in fission-fusion societies — communities split into smaller, shifting subgroups throughout the day.
- A single chimpanzee community can include 20 to over 100 individuals.
- Chimpanzee society is generally male-dominated, with males competing for rank within the group.
- Grooming is central to chimpanzee social life, reinforcing bonds and defusing tension.
- Chimpanzees form long-term friendships and alliances that can last for years.
- Mothers carry and nurse infants for several years, and the bond between them can last a lifetime.
- Chimpanzees have been observed comforting group members in distress with hugs and touch.
- Adult males patrol the boundaries of their territory and can be highly protective of it.
Communication
- Chimpanzees combine vocal calls, facial expressions, gestures, and posture to communicate.
- The "pant-hoot" call can travel over a kilometre through dense forest.
- Chimpanzees have distinct calls for excitement, alarm, and greeting.
- Facial expressions in chimpanzees are strikingly similar to human ones, including a "play face" resembling a laugh.
- Chimpanzees can understand pointing and gaze direction from humans and other chimps.
Behaviour and diet
- Chimpanzees are omnivores — the bulk of their diet is fruit, but they also eat leaves, seeds, insects, and occasionally meat.
- Chimpanzees have been documented hunting cooperatively, including organised group hunts for smaller monkeys.
- They build a fresh sleeping nest of bent branches and leaves nearly every night.
- Chimpanzees are capable of forward planning, sometimes carrying tools to a location they intend to use them later.
- Some populations have been observed self-medicating by eating specific plants that appear to combat parasites.
Uganda and Bulindi
- Uganda is home to several important wild chimpanzee populations, including in Western Uganda's forest fragments.
- The Bulindi chimpanzee community survives in a patchwork of remnant forest surrounded by farmland and villages.
- A multi-year study of the Bulindi chimps recorded how they cross a busy road running through their territory, revealing specific behavioural strategies to reduce collision risk.
- The Bulindi Chimpanzee & Community Project monitors this community daily to understand how the chimps adapt to a fast-changing landscape.
- Forest corridor replanting along rivers is helping reconnect fragments of Bulindi's forest so chimpanzees can move more safely between them.
Threats and conservation
- Chimpanzees are classified as Endangered by the IUCN.
- Habitat loss from agricultural expansion is the single biggest threat to wild chimpanzees.
- Human-chimpanzee conflict rises sharply as forest shrinks and chimps and farmers compete for the same land.
- Chimpanzees are vulnerable to human respiratory diseases, which can spread easily through close contact.
- Snaring intended for other bushmeat species frequently injures or kills chimpanzees as bycatch.
- Reforestation and forest-enrichment programmes can measurably reduce crop-raiding and conflict over time.
- Providing local communities with alternative income sources — like education sponsorship and small livestock projects — reduces pressure on the remaining forest.
- Energy-saving stoves, distributed to households near chimpanzee habitat, cut firewood demand and forest degradation.
- Long-term daily monitoring of chimpanzee communities is one of the most effective early-warning tools conservationists have.
- Every wild chimpanzee population that survives today does so because habitat, community livelihoods, and daily protection efforts are all addressed together — not separately.
- Chimpanzees can catch a yawn from another chimpanzee, a form of contagious behaviour linked in other species to empathy.
- Wild chimpanzee density and behaviour can vary hugely between sites just a few hundred kilometres apart, depending on habitat and human pressure.
Related Reading
Want to help protect one of these populations directly? Support the Bulindi Chimpanzee & Community Project and its work in Western Uganda.