Bird Issues

Coupla bird issues. About 2-3 weeks ago I was looking out the kitchen door near midday at a pair of white winged doves. Spotted a flash of green on the side of the neck just below the black streak. Looked more closely with 8X36 binoculars and saw a scattering of individual green feathers among the gray, on both sides of the necks of those two birds.    

Nothing in my books about that. Looked at doves since and no green. Would like to document it because it might be a new observation.   New subspecies.   New ... something.

Another issue. A little twitchy bird has been bugging the heck out of me for over a year now. It's olive green above, yellow below, with a white patch on the belly. It's call is a lot like a cardinal's "chk ... cnk ... cnk" pr "Tnk ... tnk ... tnk" but definitely not piercing like the cardinal's call. Unless it was different birds I've misidentified it as a yellow breasted chat or nashville warbler.

What I saw today is not a chat. No dark patterns, just olive green above and yellow below. And white on the very bottom.   As I said, twitchy, nervous, furtive.   

I heard the call a bit ago and saw movement in my now naked pecan tree across the street. It was pecking at the nut clusters.     Got 10X42 binoculars. Took long shaky looks at the bird. Except for a small eye ring there is nothing distinctive except the colors I described. What the hell is it?

Not a vireo, has to be a warbler. According to my Natl Geo guide, an immature Nashville Warbler. But immature so long?

My life list has a lot of question marks on it.