Results 201 to 210 of about 205,543 (241)
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Science, 1970
Formation flight of birds improves aerodynamic efficiency. Theoretically, 25 birds could have a range increase of about 70 percent as compared with a lone bird, the advantage being more pronounced when there is a tail wind. A vee formation is required to equally distribute the drag saving, and, contrary to other statements, the lead bird does not ...
Lissaman, P. B. S. +1 more
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Formation flight of birds improves aerodynamic efficiency. Theoretically, 25 birds could have a range increase of about 70 percent as compared with a lone bird, the advantage being more pronounced when there is a tail wind. A vee formation is required to equally distribute the drag saving, and, contrary to other statements, the lead bird does not ...
Lissaman, P. B. S. +1 more
openaire +3 more sources
Biological Reviews, 1948
SummaryBird flight can be studied neither as a problem in physics nor from the standpoint of biology alone. Both points of view are necessary and complementary.It is convenient to consider separately those birds which habitually glide or soar in air currents and those which normally fly by continuous flapping of their wings.The gliding and soaring ...
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SummaryBird flight can be studied neither as a problem in physics nor from the standpoint of biology alone. Both points of view are necessary and complementary.It is convenient to consider separately those birds which habitually glide or soar in air currents and those which normally fly by continuous flapping of their wings.The gliding and soaring ...
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Nature, 1924
SOME observations which I made on the flight of gulls two years ago on a trip to the Gambia were confirmed lately by observations in the Irish Sea and Atlantic. With the vessel (some 300 tons reg.) proceeding N.N.E. in a steady fresh E.N.E. wind, the gulls flew head to wind, keeping practically the same position in or over the stern of the vessel ...
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SOME observations which I made on the flight of gulls two years ago on a trip to the Gambia were confirmed lately by observations in the Irish Sea and Atlantic. With the vessel (some 300 tons reg.) proceeding N.N.E. in a steady fresh E.N.E. wind, the gulls flew head to wind, keeping practically the same position in or over the stern of the vessel ...
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2005
Abstract A bout of flight behaviour starts with the take-off event followed by a passage through the air over a certain distance and ends with a landing manoeuvre. By analysing repeated flights under controlled conditions the choice of flight strategies of a bird can be detected.
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Abstract A bout of flight behaviour starts with the take-off event followed by a passage through the air over a certain distance and ends with a landing manoeuvre. By analysing repeated flights under controlled conditions the choice of flight strategies of a bird can be detected.
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Bird flight and optimal migration
Trends in Ecology & Evolution, 1991The development of the mechanical and aerodynamical theory of bird flight has greatly stimulated research at widely different levels in the field of bird movement. Recent work has shown that the drag of bird bodies is less than was previously assumed. Furthermore, the structure and circulation of wingtip vortices in the wake of flying birds have been ...
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Respiration during flight in birds
Respiration Physiology, 1972Abstract The respiratory systems of birds have several peculiar properties that are related to the habit of flight. In addition to gas exchange, the respiratory system streamlines the body and alters its mass distribution. The respiratory movements can be coordinated with wing movements, and flying birds seem to hyperventilate relative to exercising ...
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Dense sampling of bird diversity increases power of comparative genomics
Nature, 2020Shaohong Feng +2 more
exaly