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National Geographic : 1951 Jun
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813 Louisiana's Snowy Herons Submit to Crowding, but Each Defends His Small Apartment Nests may almost touch; but let one bird step an inch across an imaginary line and a sharp peck puts him in his place. Territorial trespass is avoided by exact flight routes back to nests. On their feeding grounds the birds may post large territories against fishing by other herons.
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