File:PSM V84 D217 2 Flocking habit of migratory birds fig5.jpg

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Description Echelon flock formation. The usual flight formation of large birds. All birds can see ahead, and towards one side, making the best arrangement for protection. The protective efficiency of the formation is little affected by an increase in the number of birds of the flock.
Source C. C. Trowbridge: On the origin of the flocking habit of migratory birds. The Popular science monthly, Volume 84, p213. New York, Popular Science Pub. Co., March 1914. Online:
Author C. C. Trowbridge
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//

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current15:39, 14 March 2018Thumbnail for version as of 15:39, 14 March 2018985 × 561 (31 KB)Ineuw (talk | contribs)Cleaned image
17:35, 14 March 2011Thumbnail for version as of 17:35, 14 March 20111,720 × 960 (85 KB)Martin H. (talk | contribs)

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