A University of Toronto study finds that a unique ritual performed by male ring-tailed lemurs may come at a significant physical cost, but it likely helps their chances in securing a mate.Ring-tailed lemurs are Strepsirrhines, a sub-order of primates who share a common ancestor with humans. They are very social animals, living in large groups with females dominating the group. Like other lemurs, they huddle in large groups in order to keep warm and maintain social bonds, with lower ranking males often excluded.