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The gestural repertoire of the wild chimpanzee
The first systematic analysis of gesture in a population of wild chimpanzees is reported, describing 66 distinct gesture types and finding no support for the idea that gestures are acquired by ‘ontogenetic ritualization’ from originally effective actions.
Gestural communication of the gorilla (Gorilla gorilla): repertoire, intentionality and possible origins
It is concluded that gorilla gestural communication is based on a species-typical repertoire, like those of most other mammalian species but very much larger, and employed for intentional communication to specific individuals.
Serial gesturing by wild chimpanzees: its nature and function for communication
It is suggested that young chimpanzees use sequences as a ‘fail-safe’ strategy: because they have the innate potential to produce a large and redundant repertoire of gestures but lack knowledge of which of them would be most efficient.
The Meanings of Chimpanzee Gestures
Great ape gestures: intentional communication with a rich set of innate signals
- R. Byrne, E. Cartmill, E. Genty, K. Graham, C. Hobaiter, J. Tanner
- BiologyAnimal Cognition
- 13 May 2017
An assessment of ape gesture is presented from that perspective, focusing on the work of the “St Andrews Group” of researchers.
Social Network Analysis Shows Direct Evidence for Social Transmission of Tool Use in Wild Chimpanzees
- C. Hobaiter, T. Poisot, K. Zuberbühler, W. Hoppitt, T. Gruber
- Biology, PsychologyPLoS biology
- 1 September 2014
Network-based diffusion analysis demonstrates that a novel tool-use behavior, “moss-sponging”, spread via social learning in a wild East-African chimpanzee community.
Lethal aggression in Pan is better explained by adaptive strategies than human impacts
It is found that males were the most frequent attackers and victims; most killings involved intercommunity attacks; and attackers greatly outnumbered their victims (median 8:1 ratio).
Laterality in the gestural communication of wild chimpanzees
While the gestural repertoire as a whole was largely employed ambilateraly, object‐manipulation gestures showed a strong right‐hand bias; moreover, as age increased, the direction (but not the extent) of hand preference shifted toward the right.
Socially learned habituation to human observers in wild chimpanzees
- L. Samuni, R. Mundry, J. Terkel, K. Zuberbühler, C. Hobaiter
- Psychology, BiologyAnimal Cognition
- 6 February 2014
Investigating the role of social learning during the habituation process of a wild chimpanzee group, the Waibira community of Budongo Forest, Uganda, finds that the immigration of two well-habituated, young females from the neighbouring Sonso community had a significant effect on the behaviour of non-hab italian individuals towards human observers, suggesting that habituation is partially acquired via social learning.
Able-Bodied Wild Chimpanzees Imitate a Motor Procedure Used by a Disabled Individual to Overcome Handicap
The distribution of the liana-scratch technique was statistically associated with individuals' range overlap with Tinka and the extent of time they spent in parties with him, confirming that the technique is acquired by social learning.