. Tierflug; eine Aufzeichnung der Beobachtung. Wie becomequite einfach für mich, den Ruhestand des Flügels-tipin flatternden Fluges der Wale, Geier und anderer Vögel zu sehen. 24. September 1910, in Jharna Nullah. Um 11.45. – mehrere Vulkane und drei Adjutanten kreisen. Sie flappten gelegentlich, wenn sie auf niedriger Ebene waren. Das Wetter war gut. Ab 1.0 Uhr gab es kleine isolierteCumuluswolken. Ein Geier, der direkt über dem Kopf flatterte, einige Meter hoch, zeigte seine Flügel beim Aufschlag weniger gebeugt als beim Abschlag. Eine Minute später war dies deutlicher im Fall der Anothervkultur, deren Flügel w
2698 x 926 px | 22,8 x 7,8 cm | 9 x 3,1 inches | 300dpi
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. Animal flight; a record of observation . as becomequite easy for me to see the retirement of the wing-tipin flapping flight of cheels, vultures, and other birds. September 24th, 1910, at Jharna Nullah. At 11.45.—Several vulturesand three adjutants circling. They flapped occasionally when at lowlevel. Weather fine. From 1.0 p.m. onwards there were small isolatedcumulus clouds. A vulture flapping directly overhead, a few metres up, showed its wings during the up-stroke less flexed than during the down-stroke. A minute later this was more clearly seen in the case of anothervulture, whose wings were more flexed than usual during the down-stroke. Shortly afterwards I saw the same phenomenon in an adjutant;but in this case the flexing seemed gradually to decrease during the up-stroke, and was followed by sudden flexing at the commencement of thedown-stroke. October 6th, 1910, at Sekundra Road Refuse Pits. At 11.5.—Adjutants starting. At first flap-circling. Then in a minute or twocircling. After a few minutes slow flex-gliding.. SI 166 ANIMAL FLIGHT. 11.20.-—Adjutants fast flex-gliding. The wing-tips were retiredperhaps as much as 450 with the front line of the rest of the wings. Thespeed was 7 metres per second against a rather strong wind. This wasat a height of 300 metres. 11.26. -—An adjutant noticed circling with wings slightly advanced.(Presumably circling had hitherto taken place with wings straight. Theadvancing is a sign of increased soarability of the air.) 11.27. —An adjutant, starting, flapped past me at a height of about5 metres over my head. It showed clearly the wing-tip extending duringthe up-stroke, and the sudden flexing at the beginning of the down-stroke. This advancing of the wing-tip during the up-stroke appears to be a matter of interest. As to itscause there are two possibilities. Firstly, it may bedue to direct muscular action of the intrinsic wingmuscles. If this were the case, then the extra exten-sion must be advantageous ; that is t
