propeller
- Aerodynamic consequences of wing morphing during emulated take-off and gliding in birds
Summary: Wing posture has a greater effect on aerodynamic performance during emulated flapping than during emulated gliding. Extended wing morphology (i.e. emarginate primaries) may be more important during take-off and landing than during gliding.
- Specialized primary feathers produce tonal sounds during flight in rock pigeons (Columba livia)
Summary: The outermost primary feathers (P10) in male and female rock pigeons (Columba livia) are specialized to produce tonal sounds during high-speed take-off at the expense of aerodynamic performance.