niittytyranni Tyrannus verticalis

Fairly large yellow-bellied flycatcher; common and widespread in western North America. Rather pale gray head with weakly contrasting whitish throat and breast, and lemon-yellow belly. Also look for black tail with white edges (but this can be difficult to see, especially when worn). Found in open habitats with tall shrubs and trees, often perched up conspicuously on a telephone wire or fence post. Compare especially with Cassin’s Kingbird, which is darker and more contrasting on the head. Winters in large numbers south to Costa Rica, often gathering in large loose groups during migration.