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Updated: Apr 1, 2026

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Published on: November 11, 2011

Cup tool use by squirrel monkeys.

Christine L Buckmaster¹, Shellie A Hyde¹, Karen J Parker¹

¹Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California.

American Journal of Primatology

|October 6, 2015

Summary

This summary is machine-generated.

Squirrel monkeys spontaneously developed cup tool use to hold food and water. This population-level tool use offers insights into primate cognition and planning abilities.

Keywords:

Saimiri planning squirrel monkey tool transport tool use

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Area of Science:

Primate Cognition
Animal Behavior
Tool Use

Background:

Spontaneous tool use in squirrel monkeys is rarely reported.
Previous research has not documented population-level tool use in this genus.

Purpose of the Study:

To document and analyze the spontaneous invention of cup tool use in captive squirrel monkeys.
To investigate the cognitive abilities underlying this novel behavior, including planning and object permanence.

Main Methods:

Observational study of a captive population of squirrel monkeys.
Detailed recording of tool use behaviors, including food and water manipulation with cups.
Analysis of strategies employed for cup acquisition, transport, and use in relation to food processing.

Main Results:

68% of monkeys used a cup (plastic slip cap) for food, and 10% also used it for water.
Cup use supplemented, rather than replaced, natural feeding and drinking methods.
Monkeys demonstrated planning by acquiring cups before food and transporting them to preferred locations.

Conclusions:

This study presents the first report of population-level spontaneous tool use in squirrel monkeys.
The findings suggest advanced cognitive abilities, including planning, in squirrel monkeys.
This research provides a new framework for studying squirrel monkey behavior and comparative primate cognition.