a heavier-than-air craft designed to be propelled through the air by flapping wings.
See full-screen video of flight.
"Built from carbon fiber, foam, and balsa wood, the Snowbird weighs just 94 lbs. and has a wingspan of 105 feet, which is comparable to that of a Boeing 737–amazingly, the Snowbird weighs less than all of the pillows on board."article.