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Related Concept Videos

Naturalistic Observations02:30

Naturalistic Observations

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If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...
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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Related Experiment Video

Updated: Dec 30, 2025

Automated Measurements of Sleep and Locomotor Activity in Mexican Cavefish
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Spider monkey sleeping sites: Use and availability.

Colin A Chapman1

  • 1Department of Biology, McGill University, Montreal, Quebec, Canada.

American Journal of Primatology
|January 23, 2020
PubMed
Summary
This summary is machine-generated.

Spider monkeys (Ateles geoffroyi) exhibit site fidelity for sleeping locations, rotating between preferred trees. Subgroup size at sleeping sites correlates with food availability, suggesting energetic cost considerations.

Keywords:
Ateles geoffroyisleeping treessubgroup size

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Area of Science:

  • Primatology
  • Behavioral Ecology
  • Conservation Biology

Background:

  • Spider monkeys (Ateles geoffroyi) are arboreal primates with complex social structures.
  • Understanding sleeping site selection is crucial for primate conservation and behavioral studies.

Purpose of the Study:

  • To investigate the behavior of spider monkeys at sleeping sites.
  • To characterize the features of these sleeping sites.
  • To determine factors influencing sleeping site selection and usage patterns.

Main Methods:

  • Field observations of spider monkeys in Santa Rosa National Park, Costa Rica.
  • Recording sleeping site usage, including frequency and rotation.
  • Analyzing subgroup composition and size in relation to sleeping sites and food availability.

Main Results:

  • Spider monkeys predominantly used specific, repeatedly occupied sleeping sites (81.6%), with occasional use of novel trees (18.4%).
  • A rotation system was observed among regularly used sleeping trees, rather than concurrent use.
  • Males were less frequently observed at regularly used sites, especially in all-male subgroups.
  • Larger subgroup sizes were associated with abundant food resources at sleeping sites, while smaller sizes correlated with scarce food.

Conclusions:

  • Spider monkeys demonstrate a preference for established sleeping sites, employing a rotation strategy.
  • Food availability significantly influences subgroup size at sleeping sites, likely due to energetic trade-offs in travel costs.
  • These findings provide insights into the behavioral ecology and resource management of spider monkeys.