Citril Finch (Serinus citrinella) (5 in.) is greenish with grey nape and two wing bars. It nests in coniferous forests in the Alps, northeastern Spain, Sardinia and Corsica.
Cassin's Sparrow. Aimophila cassinii. Fairly common on dry plains with short grass and scattered low brush. Recognized by its plain breast, finely streaked crown, gray-brown back, and dark gray tail. Grasshopper Sparrow (p. 308) is smaller and shorter tailed and has a prominently streaked crown in all plumages. Brewer's is smaller and slimmer, with notched tail and wingbars. Unlike similar species, Cassin's Sparrow often gives its song in flight, a high musical trill preceded and followed by 1 or 2 short notes. Founds summers in Texas, winters in Mexico.
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