This lizard flies without wings, using its own ribs as a parachute

Southeast Asia's Draco lizards have elongated ribs connected by skin that fold flat against the body but fan out into wing-like membranes, letting them glide over 60 metres between trees without flapping. A separate throat flap, unrelated to the gliding membranes, is used purely for signalling to other lizards.

— Jimmy A. McGuire and Robert Dudley, The Biology of Gliding in Flying Lizards (Genus Draco) and Their Fossil and Extant Analogs — Integrative and Comparative Biology, 2011