Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Black-capped Vireo, Vireo atricapilla, is a small bird native to the United States and Mexico. It has been listed as an endangered species in the United States since 1987. The IUCN lists the species as vulnerable. The Black-capped Vireo is a songbird about 12 cm (4.5 inches ) in length. Sexually mature males are olive green above and white below with faint yellow flanks. The crown and upper half of the head is black with a partial white eye-ring and lores. The iris is brownish-red and the bill is black. Females are duller in color than males and have a slate gray crown and underparts washed with greenish yellow. First year males are intermediate in coloration between adult males and females.

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