Cassin's vs Blue-headed Vireo?

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I found this vireo which is clearly in the plumbeous vireo complex but it is difficult to separate Cassin's from Blue-headed (certainly difficult for me). This bird does show the clear demarcation between the gray plumage and the throat and the throat is very white. This bird's crown appears to me quite dark gray while Cassin's, at least in Definitive plumage, are said to be brownish gray. This bird also seems to show good contrast between back and crown, which is suggestive of Blue-headed. SeEtta

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