Figure 4. Comparison of yellow on sides of typical Yellow-green (top) vs. Red-eyed Vireo (bottom). No Red-eyed Vireo (even the brightest fall immatures) shows the extensive yellow present on Yellow-green Vireo (yellow represented by hatch marks). On Yellow-green, the yellow extends from the side of the throat and then along the sides, where it is suffused with olive; the flanks and under tail are clear yellow. Red-eyeds can have fairly bright yellow under tail coverts, especially in the fall, but, in general, the yellow is paler and limited to the lower flanks and under tail coverts. The upper sides are olive, barely washed with yellow. On both species, yellow is present at the bend of the wing (especially on Yellow-green) and concealed under the folded wings.
Donna L. Dittmann
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