Photograph by National Geographic Society and Kai Schreiber/Flickr Creative Commons
Huge flocks of migrating birds as they appear on an airport's radar screen. In New York City an estimated 10,000 night-flying birds were disoriented by twin columns of light projected as a 9/11 memorial. The phenomenon was thought to be a confluence of the city's location in a migration corridor, meteorological conditions, and the phase of the moon.
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Bird's movements appear like storms on weather radar.
Photograph by Frans Lanting
Most birds migrate at night. In this composite photo, a flock of sandpipers flies close to the horizon against a full moon. Dispersed songbirds wing by high in the sky, just random blips against the stars. Now researchers can hear them as they travel.