Bird flight

thumb|right|Two different planforms are shown with a swept wing [[KC-10 Extender (top) refueling a diamond-like delta wing F-22 Raptor]]

seasonal movement of birds

long, stiff feather on the wing or tail of a bird that aids in the generation of lift and thrust

mode of locomotion used by bird species (assists birds while feeding, breeding, avoiding predators, and migrating)

collision between an airborne animal (usually a bird or bat) and a human-made vehicle (usually an aircraft)

thumb|Two flocks of common cranesthumb|A swarm-like flock of starlings

formation with units arranged in a chevron or "V" shape

book by Leonardo da Vinci

Wikimedia list article

Wikimedia list article

evolution of birds from non-flying ancestors