[Solved] Crowding out can occur when public insurance crowds out private insurance. Eusocial: Describing a complex social structure in certain animal species, where there is cooperation in caring for the young, division of labor, and overlap of generations within a colony. Heterocephalus Glaber: Also known as the naked mole-rat, a rodent known for its resistance to cancer and its ability to live in low-oxygen environments. Naked Mole-Rat: A rodent species known for its unique traits, including high resistance to cancer and pain, living in underground colonies in Africa. Rover: Typically refers to a mobile vehicle designed for exploring the surface of planets or other celestial bodies, though it can also mean someone who roams.