Family: Vireonidae, Vireos view all from this family
Description 6" (15 cm). Sparrow-sized. Olive above, yellowish below, with pale eyebrow, dark line through eye to base of bill, and no wing bars.
Habitat Open second-growth woodlands (often aspens), old clearings and burned-over areas, and thickets along streams and lakes.
Nesting 4 brown-spotted white eggs in a cup of bark strips, grasses, and mosses lined with bits of lichen and thistledown.
Range Breeds in southern Canada and northernmost United States. Winters in tropics.
Voice Like the Red-eyed Vireo but higher and slower, See-me? Here-I-am! Up-here. See-me?
Discussion Because this vireo was first described by John Cassin in 1842 from a specimen collected near Philadelphia, both its common and Latin names refer to Philadelphia, but it is by no means confined to that area. It is easily overlooked in spring since it does not sing much on migration; in addition, arriving chiefly during the last week in May, it is present when the foliage is already dense.
