A Comparison of Scan and Focal Sampling for the Description of Wild Primate Activity, Diet and Intragroup Spatial Relationships

Research on black howler monkeys (Alouatta pigra) in Palenque National Park, Mexico, reveals that different behavioral sampling methods yield varying insights into primate activity, diet, and social dynamics. While group scan sampling and instantaneous focal individual sampling generally provided comparable data on activity and diet, they exhibited biases—such as overestimating social interactions or time spent moving. Proximity data collection methods also differed; group proximity scans mirrored spatial patterns, whereas focal nearest neighbor samples better captured real-time social influence. These findings underscore the need for careful method selection in primate studies to ensure accurate comparisons across research.

Amato, K. R., Van Belle, S., & Wilkinson, B. (2013). A Comparison of Scan and Focal Sampling for the Description of Wild Primate Activity, Diet and Intragroup Spatial Relationships. Folia Primatologica, 84(2), 87–101. https://doi.org/10.1159/000348305