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Dark ibis in juvenile plumage are, in my opinion, impossible to distinguish from each other... until soft-parts coloration begins to change in White-faced. As in the bird in question, their eye color starts changing in some individuals in September. Some, probably a small minority, also show the initiation of change of facial-skin color and leg color. This bird shows color change in two of the three. While it would be impossible to rule out a second- or third-generation hybrid, I'd be comfortable identifying this as a White-faced, even in eastern Colorado, where the number of Glossy Ibis and hybrids is far, FAR larger than in California:

Southern coastal California

Eastern Colorado sampling

 

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