NEED HELP OVER AT BACKYARD

Any Birders out there ? DaveKay has sent in some photos of a visitor to his backyard. A mystery visitor. Now DaveKay has lots of birds visit and this one has him stumped. I researched for over an hour and couldn't find anything that looks the same. Googled various terms like woodpecker, flicker, catbird and fledgling. Nada. Even got out my 'North American Bird Atlas' no go. So, if you know birds, East Coast USA in particular, head over to Backyard (link to the right) and see if you can solve this mystery.
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HAPPY VIEWING !!