Abstract

We report the first record of Bronzed Cowbird (Molothrus aeneus) brood parasitism on the year-round resident Golden-crowned Warbler (Basileuterus culicivorus). Our observations represent the 105th known host species for this cowbird species and the ninth known host species from the Family Parulidae. Our assignment of these records to the true host list are based on observations of a pair of Golden-crowned Warblers feeding caterpillars to a Bronzed Cowbird fledgling in a shade coffee plantation in Zentla, Veracruz, Mexico.

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