LIFT OFF! How do birds do it? You can figure it out by building different bird models, with different features that may or may not help it fly.

A BIG ENOUGH WING Hummingbirds beat their tiny wings hundreds of times a second. Condors glide for hours without flapping once. Compare the biggest and smallest wings..

SHAPES AND SIZES A bird's wings and an airplane's wings both have to keep it aloft. Both are also designed to fly specific ways. See how different wing types are good for different kinds of flight.