Living in groups has profound impacts on numerous aspects of a species’ biology. As a result, understanding why groups form and why social relationships within groups vary are central themes in behavioral biology. This seminar will reveal how studies of largely unobservable subterranean rodents are generating new insights into the ecology, endocrinology, and evolution of group living. From naked mole-rats to tuco-tucos, tojos, and cururos, these often little-known animals are helping to reshape our understanding of animal social behavior.