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"Male" Position Call
פרטי השורה
Following the contentious split of Western Flycatcher identification of the two resulting species has been difficult. Measurements in hand rely on the shorter wing morphology of Pacific-Slope and a series of primary feather measurements based on sex. Even so only roughly 60-70% of birds can be identified by this method. In the field the male position note is the best field method to separate the two with Pacific-slope giving a upslured one note tseeweep and Cordilleran giving a two note tee-seet. More information comparing the two can be found here; http://earbirding.com/blog/archives/2996 . Here is a description from Curtis Marantz; While walking east through the complex on the north side of the lake between the restrooms and the skeet-shooting area near the eastern edge of the property I heard a distinctive "tee, up"call that I immediately recognized as being that of a Cordilleran Flycatcher. We eventually managed to locate the bird as it foraged in the lower levels of the cottonwood trees over the open lawns. Over the next 30 minutes we did our best to record at least one these calls using the video capabilities of our cameras. Tom also did a very small amount of playback, in response to which this bird flew in and perched at close range. I estimate that we probably heard this bird call 6 to 10 times while we had it in view, once or twice following playback but generally spontaneously. The calls that we heard each time were a conspicuously two-noted, "tee-up!" or "pit-seet!" that was relatively high in frequency and to me seemingly with the second note higher in frequency than the first. This call was not too different in quality from the "suuweet" calls of the Pacific-slope Flycatchers that we had been hearing this morning. I nevertheless thought this bird's calls were distinctly two-parted. As noted above, this bird reacted strongly to playback of calls by Cordilleran Flycatcher by approaching rapidly and perching in the open at very close range. We never heard this bird give any other vocalizations to my knowledge. This was a small flycatcher that was typical of an Empidonax in its size, shape, and overall plumage. When seen from the side of the bill appeared to be relatively shallow and with a straight culmen and a blunt tip. This bird's head was large for a bird of its size, and it seemed to have a relatively steep forehead, a gently sloping crown, and a weak peak at the junction of the crown and the nape. In all, I thought its head shape was typical for a "Western" Flycatcher. I thought the neck was short and inconspicuous and that the body was relatively plump. I noted a medium-length primary projection that I suspect was approximately one-half the length of the exposed secondaries, and I thought the tail was at least as long as the body. This bird's plumage patterns were typical of an Empidonax and its coloration was essentially identical to that of a Pacific-slope Flycatcher. As far as I could determine, the forehead, crown, face, back, scapulars, and rump were a relatively bright olive-green in color. I even thought this bird's upperparts were the brighter end of the spectrum for a "Western" Flycatcher. Also much like a Pacific-slope Flycatcher, this bird had a well-defined almond-shaped eyering.
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