Birds fly particularly energy-efficiently. Their control mechanisms also contribute to this. This could be a model for airplanes.

DESCRIPTION: The passenger pigeon was much larger than the somewhat similarly plumed mourning dove. Adapted for speed and maneuverability in flight, it had a small head and neck; long tail; long, ...

The noble passenger pigeon's common name comes from the French term pigeon de passage, referring to the massive migrations of these birds across the sky. A flock of passenger pigeons reported in ...