ML223998161

觀察細節

Male seen in top of ash tree in sun. Type 1 Breet comports well with Pieplow West page 410 and Type 1 is the expected form in Oregon. The unusual feature is the overlay of a different call-type, given in series. This seems to be the chirp call figured by Pieplow, but he describes it as faint and used by foraging flocks. In this instance it is demonstrative and stereotyped. Series of chirps are followed by a chirp-breet dyad. At the time I supposed that it was a begging call, but later noted that no other individual, of either sex, was visible. So, this could be a form of singing. But the sonogram of the second cut suggest the bird giving peer is different from the bird giving chirp-breet (amplitude differences). Also, I dictated that the male was just sitting there. So, unseen birds could have made all of these sounds.