Cassin's Vireo
 Cassin's Vireo (Vireo cassinii) is a small North American songbird ranging from southern British Columbia in Canada through the western coastal states of the United States. This bird migrates spending the winter from southern Arizona (the Sonoran Desert) to southern Mexico.The vireo is 11–14 cm (4–6 inches) in length with a gray head back and flanks and whitish underparts.