ML509836121
Pacific/Winter Wren Troglodytes pacificus/hiemalis
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Recording of "check" calls given by a Winter/Pacific Wren that was found earlier in the day by David Rankin near the courtyard on the northeast side of the Entomology Building here recorded by Curtis A. Marantz on 29 November 2022 at the University of California, Riverside, Riverside County, California. This clip was recorded at 3:33 pm, with the bird unseen, but apparently about ten meters away and still within an acacia ground cover under what appeared to be Australian Willow (Geijera parviflora) on the slope immediately east of the courtyard on the northeast side of the Entomology Building. This recording was done after playback of Winter Wren calls.
Деталі спостереження
We arrived this afternoon just after the wren that had been found a short time earlier spent some time in the smaller shrubs along the southeastern edge of the Entomology Building before it flew across the walkway into the much more extensive undergrowth of acacia immediately east of the courtyard for this building, where it remained for the rest of our visit. Although the wren spent most of its time buried in the acacia under the Australian Willows, it did briefly come out to the wall and a tangle of dead branches in which it was a bit more visible and in which I was able to get a few mediocre photos. I also managed to get several recordings of the bird as it gave several different calls from close range. Others had dome playback before we arrived, and we did some playback during our visit to see if it responded better to Winter or Pacific Wren. The response was for the bird to approach and give several, different calls, but it generally did not appear in the open when it did so. Moreover, given my concentration on recording and photos, I never carefully looked at this bird today, so my description is rather superficial and based largely on what I saw of the bird without binoculars from close range while trying to record and more briefly either through my binoculars or my camera viewfinder when it popped up. My views overall were likely insufficient to have assisted with the separation of Winter and Pacific Wrens, but they were more than sufficient to identify the bird as one or the other of these two species, and my general impression was that I saw nothing visually on this bird that would have eliminated a Pacific Wren. Moreover, to me, the “chimp” calls that this bird gave were harsher than I associate with a clear Winter Wren, yet they seemed lower in frequency and not quite as sharp as those of an obvious Pacific Wren. I ended up leaving the site thinking that this bird was of uncertain identity on the basis of its calls, but also leaning more toward its being a Pacific Wren than a Winter Wren. I also recorded this afternoon an even sharper “chik” call, a shrill “tzeeez”, and a sharp rattle of relatively high frequency that may help with the identification by somebody who is familiar with the full repertoires of both species, but my familiarity with these birds is insufficient to make a definitive identification on the basis of what I heard this afternoon. This was a notably small passerine with a slim bill that was relatively short and straight, a rounded crown on a head that was moderately large for the bird’s size, a short and inconspicuous neck, what seemed to be short wings, and a medium-length tail that it often cocked upward. I saw the legs and feet, but I cannot now recall anything remarkable about either. My views of the plumage patterns and coloration were about as superficial as those of the structure. Overall, this was a dark brown bird with the head, upperparts, and wings a dark, chocolate-brown with subtle chestnut tones, but only the tail appeared to be more rufescent. I also noted fine, dark barring throughout the remiges and rectrices. The pale bars on the primaries visible along the leading edge of the closed wing appeared more cinnamon than whitish to me, but I did see, and my photos show clearly, some white spotting or speckling on what appear to be the wing coverts. Also apparent was a relatively narrow, yet conspicuous, supercilium that to me appeared to be a deep buff to cinnamon-buff in color. Below the supercilium was a postocular stripe that appeared to be about the same dark brown color as the crown, but the lower part of the face was again a deep buff to cinnamon-buff in color. I did not think the throat or breast appeared particularly whitish or grayish in the field, but they may not have been quite as obviously cinnamon as I may have expected on some Pacific Wrens. My views were likewise insufficient to have seem if the underparts were extensively barred, but my photos do show sharply demarcated stripes of white on the undertail coverts. I think the bill and eyes were dark, but I think the legs may have been pinkish.
Технічна інформація
- Записуючий пристрій
- Nagra ARES-BB+
- Мікрофон
- Sennheiser MKH-20
- Допоміжні пристрої
- Roché 30" fiberglass parabola
- Розмір вихідного файлу
- 4.52 MB