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Updated: Jan 21, 2026

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Leaf-pile pulling: an unusual play pattern in wild chimpanzees.

Toshisada Nishida1, William Wallauer

  • 1Laboratory of Human Evolution Studies, Graduate School of Science, Kyoto University, Kyoto, Japan. nishida@jinrui.zool.kyoto-u.ac.jp

American Journal of Primatology
|August 12, 2003
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Researchers discovered a unique chimpanzee play behavior called "leaf-pile pulling" (LPL) in Mahale, Tanzania. This locality-specific behavior involves raking leaves and may represent a learned tradition, highlighting potential cultural variations in animal play.

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Area of Science:

  • Ethology
  • Primatology
  • Animal Behavior

Background:

  • Play in nonhuman animals is often assumed to be uniform across different locations.
  • Previous research has not investigated potential local variations in animal play behaviors.
  • Understanding behavioral diversity is crucial for comprehending animal cognition and culture.

Purpose of the Study:

  • To document and describe a novel, apparently locality-specific form of chimpanzee play.
  • To analyze the characteristics and age-related variations of this unique play behavior.
  • To explore the potential origins and implications of this behavior for animal culture studies.

Main Methods:

  • Observation and video recording of chimpanzee behavior in Mahale, Tanzania.
  • Detailed description of the 'leaf-pile pulling' (LPL) behavior, including performer actions and interactions.
  • Comparison of LPL occurrence and characteristics with observations from Gombe, Tanzania.

Main Results:

  • A unique play behavior, 'leaf-pile pulling' (LPL), was identified in Mahale chimpanzees.
  • LPL involves backward locomotion while raking leaves, with elements of locomotor, object, and social play.
  • Older individuals (≥ 8 years) engaged in LPL over longer distances and on slopes compared to younger ones (< 8 years); the behavior was less frequent at Gombe.

Conclusions:

  • Leaf-pile pulling (LPL) appears to be a locality-specific behavior, potentially unique to the Mahale chimpanzee group.
  • The behavior's characteristics suggest it may be a learned tradition rather than solely individual learning.
  • This finding underscores the importance of considering local variations and potential cultural transmission in the study of nonhuman primate play.