. Outlines of zoology. -Wings coming down.—From Marey. Modes of flight.—There are three chief modes of flight i—I. By gliding or skimming, during which the bird has its wingsspread, but does not flap them, depending for its movement on the. Fig. 377.—Wings completely depressed.—From Marey. velocity acquired by previous strokes, by descending from a highcito a lower level, or by the wind. This may be readily observed ingull and heron, in a pigeon gliding from its loft to the ground, or ina falcon swooping upon its quarry. SONG COURTSHIP—NESTS. B77 2. By active strokes of the wings, in which the
. Outlines of zoology. -Wings coming down.—From Marey. Modes of flight.—There are three chief modes of flight i—I. By gliding or skimming, during which the bird has its wingsspread, but does not flap them, depending for its movement on the. Fig. 377.—Wings completely depressed.—From Marey. velocity acquired by previous strokes, by descending from a highcito a lower level, or by the wind. This may be readily observed ingull and heron, in a pigeon gliding from its loft to the ground, or ina falcon swooping upon its quarry. SONG COURTSHIP—NESTS. B77 2. By active strokes of the wings, in which the wings move down-ward and forward, backward and upward, in a complei curve. Thisis of course the commonest mode of flight. 3. Bj sailing or soaring with motionless spread wings, in which thebird does, not necessarily lose in velocity, or in vertical positibn, as isthe case in gliding. It is illustrated by such birds as- crow, falcon,stork, albatross, and has been observed only when there was wind. Song of birds-.—Singing is a natural expression of emotionalintensity. It is richest at the breeding season, and is always best andoften solely developed in the males. But song in any excellence is thegift of comparatively few bird
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Keywords: ., bookcentury1900, bookdecade1910, bookidcu3192, booksubjectzoology
