Assuming this to be one of the calling H. versicolor (See my other observation) Can’t confirm that this one was calling however.
Tracked down one individual calling. At least 3 in the area near my creek. More birdlike drawn out trill compared to the buzzy insect-like Cope’s trill. See the recording. I haven’t had versicolor this far west in the county.
I believe this is the same individual, found initially on 5/1, then again on 5/6. In a cup to relocate out of an aviary mew.