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Goldfinch ReproductionGoldfinches are primarily monogamous birds. For the American goldfinch mating occurs from late July through early September. The female lays 3-7 light blue eggs. Eggs are incubated for 12-14 days. The young will leave the nest after 11-15 days from hatching. The European goldfinch lays 4-6 bluish-white eggs. Eggs hatch within two weeks. 
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