What distinctive facial markings characterize adult White-eyed Vireo plumage?
Answer
Bright yellow spectacles and white iris
The most recognizable features that aid in distinguishing the adult White-eyed Vireo from other vireos are specific features of its head and face. Adults display a gray head contrasting with an olive-green back, but the key identifiers are the bright yellow rings surrounding the eyes, often referred to as 'spectacles,' and the eponymous white iris. This stark contrast between the yellow spectacles and the white iris creates a highly visible facial pattern, even though the bird prefers deep cover. The presence of the white iris is a crucial characteristic that differentiates adults from juveniles, who possess dark eyes.
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