I was taking a walk in my neighborhood a couple of months ago (May 7) and I saw a fascinating bird. I was not fast enough to get a picture, but from what I could tell, it had a warbler- like posture. I could see the bottom, which was mainly white, with what looked like a little bit of pastel yellow on the chest and just under the wings. The yellow was barely there, but you could see it. From the final glimpses I caught, the top was a light brown. Any ideas?