…I think. Or maybe a Vireo.
It looks a lot like the Gnatchatcher drawing in the Peterson Field Guide and less like the photos on Cornell’s All About Birds website. The eye ring points to a Vireo.
Either way, it was a perky energetic bird that mostly stayed hidden by branches of the trees he was inspecting. A dead limb let me get a few clear shots.
A flash of the tail and he was gone.
I’ve been calling these small birds “Song Birds” but have learned while trying to identify this bird that as members of the order Passeriformes they are “Perching Birds.” The arrangement of their toes, with three pointing forward and one backward, facilitates perching. Somehow I’ve been skipping over that in my bird ID activities.