Flying Dragons (Draco volans) do exist, but unlike birds, these lizards do not use their arm appendages to fly, instead they use their ribs.
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Their small, wing-like appendages allow them to soar from tree to tree in order to escape from predators, find insects, and attract potential mates. Ultimately, they have the ability to soar more than 30 feet (about 9 meters) in one go.Their wings are rather different than your average bird’s wings, as they are actually a set of elongated ribs, which they can extend and retract on command. ...
http://myscienceacademy.org/2015/09/07/ ... indonesia/