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Experimental evidence for spatial memory in foraging wild capuchin monkeys, Cebus apella
1Department of Ecology and Evolution, State University of New York
Animal Behaviour
|December 16, 1998
Summary
Brown capuchin monkeys exhibit spatial memory for food sources. Their movements suggest memory, but require knowing their detection field to confirm, differentiating it from random foraging.
Area of Science:
- Animal behavior
- Cognitive ecology
- Primate research
Background:
- Assessing spatial memory in wild animals is challenging due to unknown food availability and detection abilities.
- Natural food scarcity in winter provided an opportunity to study foraging behavior.
Purpose of the Study:
- To investigate spatial memory in brown capuchin monkeys.
- To determine if observed movement patterns align with memory-guided foraging or random search models.
Main Methods:
- Utilized a large array of 15 feeding platforms with controlled fruit availability.
- Measured the monkeys' detection field and compared group movement patterns to random foraging models.
- Analyzed movement towards closer platforms and straight-line trajectories.
Main Results:
- Capuchin group movements favored closer platforms and straighter paths than predicted by random models with their known 82m detection field.
- Observed behavior matched random models only with unrealistically large search fields (225-350m).
Conclusions:
- Movement patterns suggest spatial memory guides brown capuchin monkeys' foraging.
- Confirming spatial memory requires integrating movement data with accurate knowledge of the animal's resource detection field.