The Warbling Vireo, Vireo gilvus, is a small songbird. Adults are 12 cm long and weigh 12 g. They are mainly olive-grey on the head and upperparts with white underparts; they have brown eyes and the front of the face is light. There is a white supercilium. They have thick blue-grey legs and a stout bill. Western birds are generally smaller.

Warbling Vireo

The Warbling Vireo, Vireo gilvus, is a small songbird. Adults are 12 cm long and weigh 12 g. They are…

"Similar to V. gilvus, but smaller; colors paler; bill more depressed; upper mandible almost black; 2d quill much shorter than 6th" Elliot Coues, 1884

Warbling Vireo

"Similar to V. gilvus, but smaller; colors paler; bill more depressed; upper mandible almost black;…