Ava, the Burke family, and I did not find the mystery hummer today, although the male ANNA'S was present, and a surprise TOWNSEND'S WARBLER.
Aaron Bowman looked very closely at my photos and those shared by Ava and suggested that it looks more like a female young of the year Anna's. Its tail seems long or the wings too short for a Costa's, and the front is flecked with green like an Anna's. (Good eye, Aaron!)
Anna's are thought to nest here, but this is undocumented. That, however, could explain how such a youngster is here in Seward.
He also thought that the very active male looks like a subadult from last year, and those emerging feathers are new adult feathers. That makes sense to me.
I appreciate any other ideas, and will keep trying to refind it to get photos showing the tail and wing projection.
Thank you, Aaron B!
Seward Sporadic Bird Report Reporter