heavier-than-air craft that is propelled by the flapping of wings

a flapping winged aircraft

a flying machine that mimics the flight of birds

a form of aircraft that flies by flapping it's wings

a machine designed to fly by the action of flapping wings, as does a bird

a machine that flies by flapping itswings

a machine that flies by flapping its wings just like a real bird

an aircraft heavier than air that flies like a bird by flapping it's wings

an aircraft that flies by flapping its wings

an aircraft that has flapping wings, like a bird, instead of a propeller

An aeroplane that flies by flapping its wings like a bird.

An ornithopter (from Greek ornithos "bird" and pteron "wing") is an aircraft that flies by flapping of the wings. Since many examples of flapping-wing flight exist in nature, such as birds, bats, and insects, designers seek to imitate this mode of flight. Ornithopters are usually built on the same scale as these flying creatures.