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Raamatud Books 1 - 2 of 2 on ... flock, consisting of perhaps over a hundred birds arranged in single line, is....
" ... flock, consisting of perhaps over a hundred birds arranged in single line, is hurrying on, straight as an arrow, toward its destination, when, without warning, it suddenly makes a wide curving detour of several hundred yards, then resumes its original... "
Bulletin of the Nuttall Ornithological Club - Page 135
by Nuttall Ornithological Club - 1881
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The Game Birds of California ...

Joseph Grinnell, Harold Child Bryant, Tracy Irwin Storer - 1918 - 642 lehte
...of several hundred yards, then resumes its original course only to frequently repeat the manoeuvre, but always with such unison that the closest scrutiny...addition to this horizontal movement is a still more interesting vertical one which often occurs at the same time as the other but generally by itself....
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Life Histories of North American Wild Fowl: Order Anseres (part)

Arthur Cleveland Bent - 1923
...only to frequently repeat the maneuver, but always with such unison that the closest scrutiny falls to reveal the least break or Irregularity in the line...addition to this horizontal movement is a still more interesting vertical one which often occurs at the same time as the other but generally by itself....
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