ABS 2023
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Those Who Flock Together Fight Together: Social Influences on Cooperation in Juvenile Vervet Monkeys
Madison Clarke1, Chloe Vilette1, Tyler Bonnell2, Louise Barrett1, S. Peter Henzi1. 1University of Lethbridge, Lethbridge, AB, Canada; 2University of Calgary, Calgary, AB, Canada

We do not yet understand how juvenile non-human primates come to participate in intergroup conflict (IGC) given they should be risk-averse. To better understand how juveniles come to participate in IGC, we take advantage of a long-term database from a wild population of three habituated troops of vervet monkeys (Chlorocebus pygerythrus) which are known for their high rates of IGC. We constructed annual grooming, spatial association, and IGC ego networks for each juvenile. We then compared the networks by calculating cosine similarity which allowed us to capture the similarity between the types of networks. We then constructed a multilevel Bayesian model to determine how network similarities influence juveniles’ likelihood to participate in IGCs. Early results show that the similarity between the spatial association and IGC networks has a positive effect on participation. In contrast, we found no effect on participation for cosine similarity between the grooming and IGC networks. We consider how social network structure promotes cooperation in the absence of linguistically acquired cultural norms.