Chimpanzees demonstrate individual differences in social information use.

Area of Science:

• Behavioral Ecology
• Primatology
• Cognitive Ethology

Background:

• Social learning is crucial for behavior diffusion in animal populations.
• Inter-individual variation in social information use is poorly understood.
• Previous studies focused on transmission biases, not individual differences.

Purpose of the Study:

• To investigate individual differences in social information use in chimpanzees.
• To quantify the repeatability of social learning behavior across multiple studies.
• To identify factors influencing social information use, including sex, age, and rearing history.

Main Methods:

• Compiled data from 16 social learning studies involving 167 chimpanzees over 12 years.
• Developed a Social Information Score (SIS) based on participants' ability to use social information.
• Utilized Bayesian binomial mixed effects models to analyze individual variation and influencing factors.

Main Results:

• Individual identity accounted for approximately 50% of the variance in SIS, indicating high repeatability.
• Females were 15-24% more likely to use social information than males, influenced by rearing history.
• No significant effects of age or prior research experience on SIS were found; trait showed low heritability.

Conclusions:

• Individual differences play a critical role in chimpanzee social learning behavior.
• Sex and rearing history are significant factors influencing social information use.
• The study introduces a novel and transferable methodology for assessing individual variation in social learning.