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Palm Warbler: Immature or non-breeding adult?

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Today on a grassy hill in northeastern Illinois.

Is this Palm Warbler immature or is it an adult in non-breeding plumage? 

I'm leaning towards the latter based on behavior. It adroitly used a chain link fence to keep itself separated from an American Kestrel that was trying to catch it, first on one side of the fence and then the other side.  The warbler chipped the whole time, as if teasing the kestrel.

O8nB3mJ.jpg

vnAZaSW.jpg

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This is the drabber Western Palm Warbler. 

I didn't know there was such a thing as a Western PAWA nor would I have expected to find one in Illinois, THANKS MUCH!

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Aging warblers can be a bit challenging. The only thing I see here that I find useful is the tail feathers which appear a bit pointed, which would suggest a youngster, but I'm far from sure about that.

It is indeed a Western Palm Warbler, as is every Palm Warbler we see here. Western here refers to west of the Appalachians!

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