Today at Mud Pond Conservation Area, I watched for several minutes a bird that was vireo size and shape. It moved a lot, staying in the top third of tall trees. It was all white or pale underneath, with a bright white wing bar. I saw its head only briefly; it didnít appear to have an eye stripe. (I never saw its back.) It was the loudest singer in the quiet woods, singing about eight times in two minutes, a clear mostly two-syllable up-and-down song. The best I can do to reproduce it in words is CHEE ur Ö. chee ur with an occasional WEE bur thrown in. - The wing bar and lack of eye stripe ruled out Red-eyed (and the song wasnít right, but young birds at this time of year sometimes fool me), and no other vireo seems right either. Can anyone think of anything else that would fit the description?