File:PSM V84 D217 2 Flocking habit of migratory birds fig5.jpg
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|DescriptionPSM V84 D217 2 Flocking habit of migratory birds fig5.jpg||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: archive.org.|
|Author||C. C. Trowbridge|
|Public domainPublic domainfalse|
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, 1928.
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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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|current||15:39, 14 March 2018||985 × 561 (31 KB)||Ineuw||Cleaned image|
|17:35, 14 March 2011||1,720 × 960 (85 KB)||Martin H.|
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|JPEG file comment||File source: http://commons.wikimedia.org/wiki/File:PSM_V84_D217_2_Flocking_habit_of_migratory_birds_fig5.jpg|