Yellow-green Vireo (Vireo flavoviridis) [XC798084]
by Manuel Grosselet from Monkey Bay Wildlife Sanctuary, Belize (song)
Yellow-green Vireo (Vireo flavoviridis) [XC274237]
by Robert S. Ridgely from Guacimo road north of Tarcoles river, Puntarenas, Costa Rica (song)
Subspecies
Probably forms a superspecies with Red-eyed Vireo (Vireo olivaceus), Noronha Vireo (Vireo gracilirostris), Black-whiskered Vireo (Vireo altiloquus) and Yucatan Vireo (Vireo magister). Frequently treated as conspecific with Red-eyed Vireo (Vireo olivaceus), but differs morphologically and vocally, and biochemical studies indicate that the two diverged from each other c. 4-6 million years ago.
Proposed subspecies insulanus, described from I del Rey, in Pearl Is (Gulf of Panama), is synonymized with nominate.
The following 6 subspecies are recognised:
flavoviridis (Cassin, 1851) - Breeds Rio Grande delta (southern USA-north-eastern Mexico border) and southern in Mexico (from north-central Sonora in western and from northern Tamaulipas in east) through Central America to central Panama (including Coiba I and Pearl Is), possibly also to eastern Panama (Darién) and adjacent Colombia; migrates to north-western South America (Colombia south to Bolivia).
forreri Madarász, 1885 - Breeds Tres Marias Is, off Nayarit, in western Mexico; migrates to Amazonia.
perplexus (Phillips, AR, 1991) - Breeds northern Guatemala (Petén), possibly also adjacent south-eastern Mexico; migrates to eastern Ecuador and eastern Peru.
hypoleucus van Rossem & Hachisuka, 1937 - North-western Mexico (south-eastern Sonora to southern Sinaloa).
vanrossemi (Phillips, AR, 1991) - South-eastern El Salvador.
insulanus Bangs, 1902 - Pearl Islands (Gulf of Panama). Winters to upper Amazonia.