I only got a few seconds to see what I THINK was a Nashville warbler near my feeders and suet holders. Definitely like a Nashville, but had a VERY BRIGHT RED , VERY THIN wiggly line on the top of his head. Almost looked like a worm or parasite--and was very striking. I am looking for his return. Sibley shows something like a rufous patch on the top the head, but nobody talks about it. Crossley mentions it but says it's hard to see. This leapt out! Has anybody else seen anything like this. If he comes back, will try to get picture but doubt I will be able to . We have tree frogs now for about a week. Summer is on the way!