Vireos have confused ornithologists for a long time. They once believed these birds to be related to crows, and other times to shrikes. Even the Australian quail-thrushes, jewel-babblers, whipbirds and wedgebills became candidates. Long thought to be exclusively birds of New World origins, recent molecular studies show that two groups of South Asian birds, the White-Bellied Erpornis, and the shrike-babblers (genus Pteruthius) are related to vireos.
The species in this collection are: Bell’s Vireo, Blue-Headed Vireo, Cassin’s Vireo, Gray Vireo, Hutton’s Vireo, Philadelphia Vireo, Plumbeous Vireo, Red-Eyed Vireo, Warbling Vireo White-Eyed Vireo, and Yellow-Throated Vireo.