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Résumé :
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The Gray Vireo (Vireo vicinior) is a scarcely studied species of the arid mountains of the southwestern U.S. and northern Mexico, especially in the eastern part of its known range. Between May–August 2013, we located 10 nests of the Gray Vireo at the eastern canyons of the Sierra La Paila, Coahuila, Mexico; approximately 300 km SE from the closest known breeding population in Sierra Maderas del Carmen. Gray oaks (Quercus grisea) were the main nesting plant, followed by shrubby bullseyes (Nahuatlea hypoleuca). We recorded three new nesting plant species for the Gray Vireo. Six of the eight monitored nests were successful and two were abandoned due to Brown-headed Cowbird (Molothus ater) brood parasitism. This new population stands out as the southernmost, extends the breeding range of the Gray Vireo to the southeast of Coahuila, and raises questions about their potentially distinctive seasonal status, breeding ecology, and habitat use. The discovery of this breeding range extension implies the existence of more undiscovered reproductive populations throughout arid mountains of the northern Sierra Madre Oriental.
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