Cypress Knees

I thought these cypress knees make for a really cool perch for this small bird. The purpose of the knees is unknown, but many theories abound:

 

en.wikipedia.org/wiki/Cypress_knee

 

I am stumped as to what kind of bird this is. I searched all my resources and could not find a match. If you know, please respond in the comments. I am sure it is common as I have seen them in several locations. A couple of guesses on my part are yellow rumped warbler or maybe a black-whiskered vireo? I am really bad at id'ing the little guys!

 

Many kind thanks to Denis for a positive id - A palm warbler in winter (non-breeding) colors!

 

Thanks for your help!

 

Thanks so much to everyone who takes the time to view, like or comment on my photos!

 

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