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ID: "...the vestigial tenth primary - a tiny dark gray feather you can just barely see along the bottom edge of the folded wing, projecting slightly beyond the greater primary coverts. This is a sure-fire way that banders use to i.d. [Warbling and Philadelphia Vireos]."
~ Mark Stackhouse

 Warbling Vireo
 Vireo gilvus

 Garr Ranch
 Davis County, Utah
 26 Aug 2014

 by Norm Jenson
 ©Norman Jenson

 Garr Ranch
 Davis County, Utah
 26 Aug 2014

 by Norm Jenson
 ©Norman Jenson