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Bird Photos: Rarities: Chestnut-sided Warbler at Mendoza Ranch
Point Reyes National Seashore, Marin County, CA

This Chestnut-sided Warbler was reported to the Northern California BirdBox by Joe Morlan on 10/1/04 at the Mendoza (B) Ranch, Point Reyes National Seashore. It seemed to maintain fairly close company with a Blue-headed Vireo that was also present. This eastern species has become a fairly regular, although rare, fall vagrant.

   
 

While leading my Palo Alto Baylands birding class to the outer Point Reyes on 10/2/04, we were alerted to the presence of this Chestnut-sided Warbler, which was apparently found the previous day. The unusual chartreuse upperparts with complete eye-ring, and pale gray face and flanks makes this bird readily identifiable.

 

   

As with many of the vagrant Chestnut-sided Warblers that pass along the West Coast, this bird lacked any obvious chestnut-colored feathering on its flanks, indicating a young bird in its first winter plumage and probably a female. The prominent, double wingbars with a yellowish cast are also a good mark for a young bird of this species.

 

   

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