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Behavioral Assessment of Manual Dexterity in Non-Human Primates
Published on: November 11, 2011
Stone-tool usage by Thai long-tailed macaques (Macaca fascicularis)
Suchinda Malaivijitnond1, Chariya Lekprayoon, Nontivich Tandavanittj
1Primate Research Unit, Department of Biology, Chulalongkorn University, Bangkok, Thailand. suchinda.m@chula.ac.th
American Journal of Primatology
|December 6, 2006
Summary
Long-tailed macaques in Thailand use stone tools to crack open shellfish and crabs. This discovery offers new insights into primate tool use and the evolution of material culture.
Area of Science:
- Primatology
- Ethology
- Archaeology
Background:
- Long-tailed macaques (Macaca fascicularis) are widespread primates in Southeast Asia.
- Tool use in non-human primates provides insights into cognitive abilities and evolutionary pathways.
Purpose of the Study:
- To document and characterize stone-tool usage in long-tailed macaques on Piak Nam Yai Island, Thailand.
- To assess the complexity of observed tool use behaviors within existing frameworks.
Main Methods:
- Field surveys conducted in January and March 2005 on Piak Nam Yai Island, Laem Son National Park.
- Direct observation of three troops of long-tailed macaques.
- Categorization of tool use according to Matsuzawa's (1996) hierarchical classification.
Main Results:
- Two troops exhibited stone-tool use for processing prey.
- Prey items included rock oysters, gastropods, bivalves, and swimming crabs.
- Tool use was classified as Level 1 (cracking oysters) or Level 2 (cracking mollusks/crabs on a rock).
Conclusions:
- This study presents the first evidence of stone-tool usage in Thai long-tailed macaques.
- The findings contribute to understanding primate material culture and the evolution of tool use.
- Provides a new reference point for comparative studies on primate cognition and behavior.
