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• n  North American blackbird that follows cattle and lays eggs in other birds' nests

• The cowbird was not always parasitic but learned from experience that foisting its young off on other birds was a very successful way to perpetuate the species without the .

News & Articles

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• In a Bird’s Nest, an Animal Behavior Puzzle
  When scientists looked closely at the war between chalk-browed mockingbirds and shiny cowbirds, they found something unexpected.
  Dec. 10, 2013 - New York Times