Orphaned² chimpanzees are less socially competent（胜任的，有能力的） than chimpanzees who were reared by their mother. Researchers from the Max Planck Institute for Psycholinguistics in Nijmegen, The Netherlands, observed that orphaned chimpanzees frequently engaged in social play, but their play bouts⁴ were much shorter and resulted in aggression⁵ more often. Apparently⁶, chimpanzee mothers endow their offspring with important social skills. It may not come as a surprise, but mother chimpanzees seem to be important for the development of social skills in young chimpanzees. "Orphaned chimpanzees had more difficulties to successfully coordinate⁷ their social play interactions," says Edwin van Leeuwen from the Comparative Cognitive⁸ Anthropology⁹ Research Group at the Max Planck Institute for Psycholinguistics. "Since social play comprises a complex context in which signals about intentions need to be communicated, it seems that orphaned chimpanzees have missed out on valuable lessons from their mothers."

 

Van Leeuwen and his co-authors Innocent Mulenga and Diana Lisensky compared the play behaviour of 8 orphaned and 9 mother-reared juvenile¹⁰ chimpanzees at the Chimfunshi Wildlife Orphanage¹¹ Trust in Zambia. In this institution the orphan¹ chimpanzees are initially¹² cared for by humans. As soon as they are strong enough -- usually with one or two years of age -- they grow up in an orphan chimp³ group. "The chimps¹³ in the study were between four and nine years old, so they have kind of been raising each other," explains van Leeuwen. The orphaned and mother-reared chimpanzees matched in age and sex.

 

Based on previous research, the scientists expected the orphaned juveniles¹⁴ to play less frequently and smoothly¹⁵ than the mother-reared chimpanzees: After all, the orphans¹⁶ had missed their most important caretaker throughout a sensitive socialisation period, and continued to lack a safe and facilitating social environment provided by their mothers.

 

Contrary to their expectations, the orphaned chimpanzees engaged in social play more frequently than the mother-reared juveniles, although for shorter amounts of time. But social play of the orphaned juveniles resulted more often in aggression than social play of the young chimps that were reared by their mother. "Although the orphaned chimps were motivated to play," Van Leeuwen says, "it seems that they were less able to coordinate their play bouts and prevent them from resulting in aggression."

 

Just like in humans, chimpanzee mothers seem to be important for the development of adequate social skills in their offspring, the researchers conclude. Van Leeuwen: "Mothers seem to prepare their offspring for challenges that are very important for successful group-living. For orphans, however, the presence of other adult role models may alternatively be beneficial for boosting social competence¹⁷, which is an important consideration to entertain for sanctuaries¹⁸ dealing¹⁹ with integrations of chimpanzees."

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