Pretty sure it's a warbler. I saw the back of it which was all yellow/greenish yellow. White markings like stripes above and below the eyes. You can kind of make them out in this very blurry photo. Any ideas?
This one might be impossible.
Too right it is!! ;-)
Strong suspicions it is a Red-eyed Vireo (stout blue-grey legs, strong head pattern, body greenish above, yellowy below the tail), but can't be definite.