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From The Collaborative International Dictionary of English v.0.48:
Vireo \Vir"e*o\, n. [L., a species of bird.] (Zool.) Any one of numerous species of American singing birds belonging to Vireo and allied genera of the family Vireonidae. In many of the species the back is greenish, or olive-colored. Called also greenlet. [1913 Webster] Note: In the Eastern United States the most common species are the white-eyed vireo (Vireo Noveboracensis), the red-eyed vireo (Vireo olivaceus), the blue-headed, or solitary, vireo (Vireo solitarius), the warbling vireo (Vireo gilvus), and the yellow-throated vireo (Vireo flavifrons). All these are noted for the sweetness of their songs. [1913 Webster]