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Fission–fusion dynamics are thought to be mainly a response to differential availability of food resources. However, social factors may also play a role. Here, we examined whether the quality of social relationships between group members affects fission decisions. During 21 months, we collected data on social interactions and fission events of 22 spider monkeys (Ateles geoffroyi) living in a community...
Emotional responses to social interactions and the associated behavioural measures (e.g., self‐directed behaviours, SDBs) have been little studied in New World monkeys, especially in wild settings. In this study, we investigated the factors affecting anxiety in a wild group of tufted capuchin monkeys (Cebus apella nigritus) using self‐scratching (hereafter scratching) as its measure. Scratching was...
In group‐living animals, social relationships are the result of the interactions between two individuals over time and can provide fitness benefits to both the participants. Recently, components of social relationships were identified in Old World primates and ravens through the use of principal component analysis (PCA). We employed PCA to identify components that define the social relationships in...
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