This is the most common of the Vireos in the greater part of its range and is a most persistent songster, frequenting groves, open woods or roadsides. Their eyes are brown, scarcely if any more red than those of any other species and I have yet to see one with red eyes outside of mounted museum specimens. They swing their nests from the forks of trees at any elevation from the ground but usually below ten feet, and I have found them where the bottom rested on the ground; they are made of strips of bark, fibre, etc., and often have pieces of string or paper woven into the sides; they are one of the most beautiful of bird homes and are woven so strongly that old nests hang to the branches for several seasons. Their three or four eggs, often accompanied by one of the Cowbirds, are laid in May or June; they are white, sparingly specked with blackish brown. Size .85 × .55. 625. YELLOW-GREEN VIREO. _Vireosylva flavoviridis._ Range.--Southern Texas and southward to South America. Similar to the Red-eye but greener above and more yellowish on the sides. The nesting habits are the same and the eggs indistinguishable from those of that species. 626. PHILADELPHIA VIREO. _Vireosylva philadelphica_. Range.--Eastern United States breeding from northern New England and Manitoba northward. This species is much smaller than the Red-eye (length 5 in.) and is yellowish below, and without black edges to the gray crown. Their eggs do not differ from those of the Red-eyed Vireo except in size, averaging .70 × .50. 627. WARBLING VIREO. _Vireosylva gilva gilva._ Range.--North America east to the Plains, breeding north to Labrador. This Vireo is nearly as abundant as the Red-eye but is not generally as well known, probably because it is usually higher in the trees and more concealed from view. Their nests are like those of the Red-eye, but smaller and usually placed higher in the trees. The birds are even more persistent singers, than are the latter but the song is more musical and delivered in a more even manner, as they creep about among the foliage, peering under every leaf for lurking insects. The eggs are pure white, spotted with brown or reddish brown. Size .72 × .52. [Illustration 382: Red-eyed Vireo.] [Illustration: White.] [Illustration: White.] [Illustration: White.] [Illustration: 626-627.] [Illustration: left hand margin.] Page 381 [Illustration 383: C. A. Reed. RED-EYED VIREO ON NEST.] Page 382 627a. WESTERN WARBLING VIREO. _Vireosylva gilva swainsoni._ Range.--Western United States, breeding from Mexico to British Columbia. This species is like the last but said to be a trifle smaller and paler color. Its nesting habits and eggs are precisely like those of the eastern form. 628. YELLOW-THROATED VIREO. _Lanivireo flavifrons._ Range.--United States east of the Plains, breeding from the Gulf to Manitoba and New Brunswick.