Jul 7, 2003 · By testing delta-wing models and birds' tails behind bodies with wings, I empirically show that the tails of birds produce lift in a very similar way to conventional delta-wing models. …

Jul 3, 2003 · Most foot-propelled swimming birds sweep their webbed feet backwards in a curved path that lies in a plane aligned with the swimming direction. When the foot passes the most …

There are four general wing shapes that are common in birds: Passive soaring, active soaring, elliptical wings, and high-speed wings. Passive soaring wings have long primary feathers that …

The underparts are buff, while the crissum (the undertail coverts surrounding the cloaca), primaries, underwing coverts, and flanks are rich rufous-chestnut, but this is mainly visible …

A bird’s tail approximates to a delta wing and it is known that if the leading edges of a delta wing are drooped, the lift acting on the leading edges is increased and the drag reduced (Lee & Ho …

Recent investigations on the aerodynamics of natural fliers have illuminated the significance of the leading-edge vortex (LEV) for lift generation in a variety of flight conditions. A well-documented …

May 5, 2002 · This theory now provides the conventional explanation for how birds' tails work. A delta-wing theory (slender-wing theory) has been used, as part of a variable-geometry model …

Modern studies have shown that birds' ability to change the shape of their wings and tail in flight, known as morphing, allows birds to actively control their longitudinal and lateral flight ...

May 22, 2002 · A delta–wing theory (slender–wing theory) has been used, as part of a variable–geometry model to predict how tail and wing shape should vary during flight at …

Jul 3, 2003 · Most foot-propelled swimming birds sweep their webbed feet backwards in a curved path that lies in a plane aligned with the swimming direction. When the foot passes the most …