35-B-2017 Least Flycatcher
It appeared that the same bird was building the nest while the other sang, proclaiming the territory to all. The one building the nest visited the nest 3-6 times every 10 minutes throughout the 50 minutes that I observed them.
The singing bird constantly sang from perch to perch between 0749 hours and 0855 hours. As time passed, it very gradually transitioned from non-stop singing to opportunistically catching insects to primarily foraging and less singing.
I also observed the singing Least Flycatcher actively being territorial and defensive towards a nearby Western Wood-Pewee.
Throughout the time that the singing individual sang, the other bird in the pair built the nest.
FIRST ROUND VOTING:
Description and photos support identification of Least Flycatcher.
The song is diagnostic and the added description was convincing
Good description, good (and cool!) photos. I can't find any of the promised audio recordings associated with this record, unless I'm overlooking something, and the observer unfortunately never describes the song. However, I consider the photos diagnostic, the written details are good, and the observer experienced.
good description & pics - & nice documentation of breeding!
I'm convinced these were Least Flycatchers, but I wish the observer had described the song in the report.
The report mentions the distinctive song (even though the song wasn't described in the report) of Least Flycatcher. The mention of the song, combined with images of the bird in a location where they have been regular for a few years support the identification of Least Flycatcher.
While I am certain the identifications were good based on the description, habitat usage, and photos, was initially going to “reject” this record as the observer failed to describe the distinctive song of a Least Flycatcher (Empidonax minimus) in comparison to other similar species. However, after rummaging around in their public Flickr account (link provided), found a video with good audio to confirm.