Lagomorphs have a pair of incisors in each quadrant of the upper jaw, one large and rodent-like, and the other a small peg located immediately behind the larger tooth. The cheek teeth are rootless and hypsodont . The crowns of the cheek teeth are relatively simple, with transverse basins separated by enamel ridges. The upper toothrows are more widely separated than the lower, so that occlusion can take place on only one side of the jaw at a time. Another characteristic of lagomorphs is the location of the testes in males, which lie in front of the penis as in marsupials .
All lagomorphs are terrestrial.
They occupy a wide diversity of habitats, ranging from tropical forest to arctic tundra. All are herbivores that feed on grasses and other small plants. Lagomorphs have the ability to produce two types of fecal material, one that is wet and eaten again for further nutrient absorption, and one that is dry and discarded. The phylogenetic affinities of lagomorphs are controversial, although recent evidence has suggested that they may be related to rodents. Literature and references cited Diersing, V. E. 1984.