Recorded 21 May 06 on Mt. Verstovia Trail. This bird appeared to be
foraging in the canopy at about 1200 feet elevation. I am not absolutely
positive the bird in the photo is the same one in the recording, but I'm
pretty sure. If I had to guess, I would say it's probably a Chestnut-backed
Chickadee, but it sounded different than I am used to hearing. It repeated
the pattern heard in the recording more or less continuously for some time
as it moved around the canopy.