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Brown-headed Cowbird parasitism of the Black-throated Sparrow in central Arizona

M. J. Johnson, Auteur ; C. van Riper, Auteur

Dans Journal of Field Ornithology (75(3) SUM 2004)

From 1994-1996 we investigated effects of Brown-headed Cowbird (Molothrus ater) parasitism on Black-throated Sparrow (Amphispiza bilineata) nesting success in the Verde Valley of central Arizona. Of 56 Black-throated Sparrow nests, 52% were para[...]

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