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Cultural innovation and transmission of tool use in wild chimpanzees: evidence from field experiments
TLDR
Evidence from three complementary approaches in a group of oil-palm nut- (Elaeis guineensis) cracking chimpanzees at Bossou, Guinea demonstrates a mechanism for the emergence of culture in wild chimpanzees.
Development of stone tool use by wild chimpanzees (Pan troglodytes).
TLDR
Although infant chimpanzees at the age of 2.5 years already acquired basic actions necessary for nut cracking, they did not combine the actions in an appropriate sequence to perform actual nut cracking.
Use of numbers by a chimpanzee
TLDR
The present study demonstrates that the chimpanzee was able to describe the three attributes of the sample items and spontaneously organized the ‘word order’.
Aging and Fertility Patterns in Wild Chimpanzees Provide Insights into the Evolution of Menopause
TLDR
Examination of fertility and mortality patterns in six free-living chimpanzee populations finds no evidence that menopause is a typical characteristic of chimpanzee life histories, in contrast to recent claims.
Ant‐dipping among the chimpanzees of Bossou, Guinea, and some comparisons with other sites
TLDR
Observations suggest a strong influence of prey characteristics, including aggressiveness and/or gregariousness, on tool length and technique employed by the chimpanzees of Bossou, in southeastern Guinea, West Africa.
Assessing chimpanzee personality and subjective well‐being in Japan
TLDR
Comparing personality and subjective well‐being ratings of 146 chimpanzees in Japan that were housed in zoos, research institutes, and a retirement sanctuary to ratings of chimpanzees in US and Australian zoos suggests that chimpanzee personality ratings are not affected by the culture of the raters.
Contagious yawning in chimpanzees
TLDR
Contagious yawning in chimpanzees provides further evidence that these apes may possess advanced self–awareness and empathic abilities.
Road crossing in chimpanzees: A risky business
TLDR
The Bossou chimpanzees employ a phylogenetically old mechanism to adapt to a more recent dangerous situation and this film shows how this mechanism has changed over time.
Chimpanzee mothers at Bossou, Guinea carry the mummified remains of their dead infants
TLDR
Two further infant deaths at Bossou are recounted, observed over a decade after the original episode but with striking similarities, suggesting a phylogenetic continuity for a behavior that is poignant testament to the close mother-infant bond which extends across different primate taxa.
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