Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Warbling Vireo

Vireo gilvus - This drab summer resident of tall deciduous shade trees is more easily detected by its song than by sight. Look for the vireo bill and broad white-eye stripe, which is not outlined in black. This vireo is so well concealed by foliage that the male may sing from the nest. Immature has greener back, yellow flanks. Song is long and warbling.