Insect Migration by C. B. Williams

Author:C. B. Williams [C. B. Williams]
Language: eng
Format: epub
ISBN: 9780007406326
Publisher: HarperCollins Publishers

FIG. 33 Track of a narrow stream of Monarch butterflies migrating to the south in September 1935, as reported by Mr. Carr. The insects throughout the day turned suddenly to the E. at one point and then suddenly back to south at a second point about 200 yards away

FIG. 34 Diagram showing the relation between track or direction relative to the ground; course, or the orientation of the body axis of the insect; and the direction of the wind; in an insect flying steadily in one direction

It follows from this, that if an insect is flying in a variable wind in any direction (except straight into or directly with the wind), its ground track will alter with changes in the wind, unless it takes compensating action by altering the direction of its own air flight.

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