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Keywords: Soaring
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J Exp Biol (2019) 222 (1): jeb183517.
Published: 11 January 2019
... accumulate less fuel than species with low wing aspect ratio when covering a similar migration distance. Continuously flapping species accumulate the largest amounts of fuel, followed by flapping and soaring species and flapping and gliding species, while the smallest fuel loads were observed in birds...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (22): jeb186270.
Published: 19 November 2018
... 20 m but less than 40 m were categorized as meandering flight; all other data were categorized as straight flight. The temporal and spatial scales were determined by examination of tracks such as that in Fig. S1 which exhibit apparent thermal soaring; in these cases, the circle radii are smaller...
Includes: Supplementary data
Journal Articles
J Exp Biol (2006) 209 (18): 3489–3498.
Published: 15 September 2006
..., to calculate the ground speeds and airspeeds at which a gull is expected to flap or soar during foraging flight. The model results are compared with observed flight speeds, directions, and flight strategies of two species of gulls, the black-headed gull Larus ridibundus and the lesser black-backed gull Larus...
Includes: Supplementary data
Journal Articles
Journal Articles
J Exp Biol (1999) 202 (15): 2029–2039.
Published: 1 August 1999
... flight speed. The mean wingbeat frequency during powered climbing flight was 4.68 Hz, which was used to estimate the mass-specific muscle work. When falcons were leaving the colony for offshore hunting, they gained altitude by slope-soaring when there was an onshore wind. We formulated a simple criterion...
Journal Articles
J Exp Biol (1995) 198 (3): 775–781.
Published: 1 March 1995
...Vance A. Tucker ABSTRACT The anterior-most primary feathers of many birds that soar over land bend upwards and separate vertically to form slotted wing tips during flight. The slots are thought to reduce aerodynamic drag, although drag reduction has never been demonstrated in living birds. Wing...
Journal Articles
J Exp Biol (1993) 180 (1): 285–310.
Published: 1 July 1993
...Vance A. Tucker ABSTRACT The feathers at the wing tips of most birds that soar over land separate both horizontally and vertically in flight to form slotted tips. The individual feathers in the slotted tips resemble the winglets used on the wing tips of some aircraft to reduce induced drag. A wing...
Journal Articles
J Exp Biol (1988) 140 (1): 325–344.
Published: 1 November 1988
....55.1.13 Pennycuick , C. J. ( 1971b ). Control of gliding angle in Riippell’s griffon vulture Gyps rüppellii . J. exp. Biol . 55 , 39 – 46 . 10.1242/jeb.55.1.39 Pennycuick , C. J. ( 1972 ). Soaring behaviour and performance of some East African birds, observed from a motor...
Journal Articles
J Exp Biol (1987) 133 (1): 33–58.
Published: 1 November 1987
... at C L values near 0. 18 06 1987 © 1987 by Company of Biologists 1987 birds glide polar gliding performance polar curve soaring wing span During equilibrium gliding, all the forces on a glider are balanced; it neither accelerates nor decelerates. The relationship...
Journal Articles