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They found that ringtailed lemurs (Lemur catta) living in groups primarily call and respond to the individuals with which they have close relationships. While grooming is a common social-bonding experience for lemurs and other primates, the researchers found that lemurs reserved vocal exchanges for the animals that they groomed most frequently. Lemurs vocalize to essentially "groom-at-a-distance" and keep in touch when the group members they're closest with get separated such as when foraging for food, said first author Ipek Kulahci, who received her Ph.D. in ecology and evolutionary biology from Princeton. - www.sciencedaily.com