Philadelphia Vireo: Medium vireo with olive-green upperparts and yellow-washed to yellow underparts. The head has a gray cap, dark eyes, and white-bordered black eye-line. Wings are olive-green with very faint wing-bars. Undertail coverts yellow. First discovered near Philadelphia in 1842.
Range and Habitat
Philadelphia Vireo: Breeds in southern Canada and northernmost U.S. Winters in the tropics. Preferred habitats include open second-growth woodlands, old clearings, burned-over areas, and thickets along streams and lakes.
The Philadelphia Vireo is unlikely to visit Philadelphia, except during its migration.
They can coexist with Red-eyed vireos because they modify their behavior either to exclude the Red-eyed Vireo from its territory or to avoid it by foraging in areas seldom used by that species.
A group of vireos are collectively known as a "call" of vireos.
The Philadelphia Vireo has a very large range, reaching up to 2,700,000 square kilometers. This bird can be found in the United States, Canada, Mexico, the Bahamas, Belize, Bermuda, Cayman Islands, Colombia, Costa Rica, Cuba, El Salvador, Guatemala, Honduras, Nicaragua, Panama, Saint Pierre, and the Turks and Caicos Islands among others. It prefers forested areas or degraded forests. The global population of this bird is estimated to be around 4,300,000 individuals. Currently, it is not believed that the population trends for this species will soon approach the minimum levels that could suggest a potential decline in population. Due to this, population trends for the Philadelphia Vireo have a present evaluation level of Least Concern.