The Well-Connected Animal: Social Networks and the Wondrous Complexity of Animal Societies
Dr. Lee Alan Dugatkin
October 13, 2024
Dr. Lee Dugatkin’s presentation, Well-Connected Animals: Social Networks & the Complexity of Animal Societies, was based on research about the influence of social networks and information sharing on animal behavior. He believes this research can provide insights into the evolution of human social behavior. Dr. Dugatkin used the concept of social networks to emphasize their role in shaping animal behavior and the importance of understanding their structure. He discussed studies of three different species: Macaques monkeys on an isolated island near Puerto Rico; bottle-nose dolphins along the Brazilian coast; and chimpanzees in Uganda.
A troupe of Macaques monkeys were introduced to the deserted Cayo Santiago Island in the mid-20th century and have been the focus of on-going studies since then. Lee indicated that grooming behavior was a good indicator of the degree and strength of social connections within various subgroups of the monkeys. In general, these subgroups did not intermingle. He noted that Hurricane Maria in 2017 led to significant changes in the social grooming networks, with individuals forming more friendships post-hurricane. The study also found that the number of babies produced increased significantly after the hurricane. Lee emphasized the importance of understanding these dynamics, as they have implications for how both animals and humans deal with natural catastrophes.
Studies of dolphins near the Brazil coast found a unique system involving social networks within the dolphin population and how one of the dolphin networks interacts with local fishermen to the benefit of both. One of the dolphin networks would signal fishermen when their mutual prey (mullets) were in the area. The fisherman were able catch more fish because they had learned where the mullet were at and the dolphins were able to catch and eat more mullet as the fish fled the fisherman’s nets.
A researcher studying chimpanzees in the Boudango forest in Uganda witnessed the creation of a new tool, a moss sponge, by a dominant chimpanzee called Nick. The researcher noticed that after Nick created the sponge to collect water from shallow depressions, other chimps in his immediate social network began making their own moss sponges, presumably after they observed Nick’s behavior. Chimpanzees in other social networks, which did not observe Nick’s behavior, did not create or use moss sponges. However, a single chimpanzee outside of Nick’s social network, found a discarded moss sponge and learned how to make and use the tool after examining it.
Dr. Dugatkin noted that these three cases and the complexity of social networks in other animal species, including honeybees, crickets, kangaroos, and whales show how information is passed from one individual to others. Lee also suggested that someone’s propensity to join a particular political group can be illustrated, in part, by the behavior of house finches, where males with more red feathers tend to stay in their group, while those with less red plumage leave to find other groups where they can do better.
