Information on cowbird parasitism in Mexico is rare. We report the successful fledging of a brown-headed cowbird (Molothrus ater) nestling by black-capped gnatcatchers (Polioptila nigriceps) in the tropical deciduous forest of the Chamela-Cuixmala Biosphere Reserve, western Mexico, in June 2001. We observed 2 additional gnatcatcher pairs feeding a single brown-headed cowbird fledging. Opportunistic observations of nests of other species and few captures of brown-headed cowbirds during 18 months of intensive mistnetting suggested that cowbird abundance and parasitism was low in the reserve.
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1 June 2004
FIRST REPORT OF COWBIRD PARASITISM ON THE BLACK-CAPPED GNATCATCHER IN WESTERN MEXICO
Jorge H. Vega Rivera,
Fernando Alvarado,
Taĺia Valdivia,
John Rappole
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