Barbara E. Kus Melissa A. Blundell 2011 <p><span>We provide the first known documentation of a male Least Bell's Vireo (</span><i><span class="genus-species">Vireo bellii pusillus</span></i><span>) breeding with a female White-eyed Vireo (</span><i><span class="genus-species">V. griseus</span></i><span>) and the first report of a White-eyed Vireo breeding in California at the San Luis Rey River, Oceanside, San Diego County. We discovered the pair building a nest on 12 May 2010. The female laid four eggs, and the pair successfully raised and fledged four nestlings. We collected DNA samples from each nestling and the female during the nestling stage and banded them with a numbered federal leg band for future identification. We obtained detailed nest measurements after fledging and monitored the territory for further nesting attempts. No additional nesting attempts were detected.</span></p> application/pdf 10.1676/10-184.1 en The Wilson Ornithological Society First record of interspecific breeding of Least Bell's Vireo and White-eyed Vireo article