Glires: Lagomorpha

Dental formula 2/1, 0/0, 3/2, 2-3/3. I2/1, with 2nd incisor immediately behind 1st, small and peg-like; incisors ever-growing, with at least some enamel on posterior, as well as anterior, face; flaps of skin can meet behind incisors (can gnaw with mouth closed); C0/0 with large diastema; cheek teeth hypsodont, rootless (in R forms), with transverse ridges; lower cheek teeth laterally closer than uppers, so that only one side occludes at a time and lateral grinding is required; masseter and pterygoideus large; coronoid process and temporalis reduced; fenestrated skull bones, i.e. with areas of thin, lattice-like bone (esp. maxilla & parietals -- see leporidae.jpg); auditory bulla from ectotympanic only & entotympanic is absent; tail reduced or absent; elbow joint limits forelimbs to antero-posterior motion; tibia & fibula distally fused; digits 5/4-5; soles of hind feet generally furred; stance digitigrade when moving quickly; all herbivorous, with very large cecum; various specializations for rapid reproduction including induced ovulation (eggs shed in response to copulation) and 'postpartum estrus' (can conceive immediately after giving birth).