A single Myrtle Warbler graced us with its presence too. It could be confused with a female but it has worn primary coverts which makes it a second year male. The arrow points to the worn and abraded primary coverts. Remember coverts are those feathers that cover or protect a major set of feathers.
I think the highlight of the day was this gorgeous Swamp Sparrow. I have never seen so many vivid browns, reds, and blacks on a bird. I also took a picture to show the difference in the amount of red or rust on their heads. The bird on the right is an adult bird, probably several years old, but we can't really tell since they molt all their feathers after their second year and then on an annual basis.
Even a sparrow has some unusual merits that one might not see without closer inspection.