Wild chimpanzees used tool transfers to open brief learning opportunities

The research question and why it matters

The researchers asked whether transfers of foraging tools and baobab fruit impose an immediate cost on the possessor and create an immediate benefit for the recipient—behavioral criteria that can support, but not fully establish, teaching and social learning.

Field studies at Taï, Gombe, Goualougo and other sites have shown that young chimpanzees observe skilled individuals, practice for years and sometimes receive termite-fishing or nut-cracking tools. Experiments and long-term observation support social learning of chimpanzee traditions. The Dindefelo work adds four savanna technologies—including algae fishing and baobab pounding—and compares behavior immediately around naturally occurring transfers.

What researchers found

The cameras recorded 33 tool transfers and four fruit transfers. Most tool transfers were recoveries or tolerated takes and occurred between mothers and offspring. After non-recovery transfers, initial possessors spent less time using the tool and made fewer insertions, while recipients spent more time using it and made more insertions and mouthfuls. Two detailed cases—ant dipping and baobab pounding—illustrated how access to an object and an experienced individual could facilitate practice.

How the research worked

From 2017 to 2025, camera traps collected 14 hours 58 minutes of footage at 14 algae-fishing, ant-dipping and termite-fishing sites, plus 30 minutes at 11 baobab-pounding sites. Researchers coded transfers and compared each animal's tool-use time, insertions and food mouthfuls during the 30 seconds before and after a transfer. Recoveries of abandoned tools were excluded from the principal before-and-after models, and linear mixed-effects models accounted for repeated observations.

How to interpret this design

The result is conditional on the model structure, inputs, boundary conditions and scenarios chosen by the researchers. Agreement with known observations strengthens confidence, but a projection is not a direct observation of the future or the inaccessible past.

Animal research can reveal biological mechanisms and generate testable hypotheses, but it is preclinical evidence. Differences in physiology, dose, environment and disease models mean that human benefit or safety cannot be assumed.

What it means

The observations broaden evidence that chimpanzee technology is transmitted through social opportunities, including in a dry savanna population and across several foraging behaviors. Tolerance, leaving a tool behind or actively allowing a youngster to take it can give an immature animal immediate access to materials and technique. Calling that behavior teaching uses a functional animal-behavior definition; it does not imply language, formal instruction or knowledge of another mind.

How this fits with previous research

Field studies at Taï, Gombe, Goualougo and other sites have shown that young chimpanzees observe skilled individuals, practice for years and sometimes receive termite-fishing or nut-cracking tools. Experiments and long-term observation support social learning of chimpanzee traditions. The Dindefelo work adds four savanna technologies—including algae fishing and baobab pounding—and compares behavior immediately around naturally occurring transfers.

Questions still unanswered

• Do recipients become more proficient days or months after receiving tools?
• When does a possessor actively modify behavior for a learner rather than merely tolerate a take?
• Do daughters and sons receive different opportunities after accounting for age and proximity?
• How do transfer patterns differ among forests, woodlands and savanna communities?
• Can individual identification and longer continuous observation distinguish teaching from kinship and social tolerance?