Family: (Vireonidae) Vireos
Preferred Habitat: Woodlands
Seasonal Occurrence: Spring and fall migration
Notes by Susan Billetdeaux: Philadelphia Vireos can be a challenge to identify. They are small with grayish-green upperparts, no wingbars, and pale yellow underparts. The amount of yellow is highly variable. Note the white eyebrow and black line through the eye. Greatest numbers are seen during spring migration, but they are never very common. Moreover, they tend to occur high up in the tree canopy, so are difficult to spot. Similar species include Warbling Vireo and Tennessee Warbler.