107. The Blue-grey Warbler (Sylvicola cærulea) 108. The Blue Yellow-backed Warbler (Sylvicola americana) 109. The Black-throated Blue Warbler (Sylvicola canadensis) illustration from Zoology of New York (1842–1844) by James Ellsworth De Kay.
Forfatter: New York Public Library (Source)Kilde: rawpixel.com