Dermoptera

Skull broad & flat; dental formula 2/3, 1/1, 2/2, 3/3; I2 caniniform; i1-2 broad & comb-like, used for grooming and scraping leaves; canines double-rooted; broad, 3-cusp molars with shearing enamel lophs; palate broad & flattened; large tongue; large forward-facing eyes with overlapping fields of vision; postorbital bar nearly complete; tympanic bullae flattened; thoracic neural spines short; ribs broad; sternum slightly keeled; radius elongated, but distal ulna reduced; digits 5/5 with sharp, curved claws (climbing); membranes from neck to fingers, between limbs, and from foot to tip of tail; sloth-like, under-branch climbers; long-distance gliding (>100 m); herbivorous, frugivorous; long intestinal tract with very large cecum; 1 offspring per pregnancy; strictly arboreal & unable to walk.