ML590196061
投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
- 音声
- さえずり
- プレイバック(音声の再生)
- プレイバック(音声誘引)使用
視聴覚メディア・ノート
Song by a continuing White-eyed Vireo, found the previous morning by Russell Kokx, here recorded by Curtis A. Marantz on 28 June 2023 at Edwards Field, Lone Pine, Inyo County, California. When recorded, the bird was unseen, but apparently about eight meters away and about eye-level in a dense, unidentified shrub that had the character of a willow, but it was not a willow. This recording was made after some playback, to which the bird's response was minimal, at times approaching weakly, but giving similar songs.
観察結果の詳細
After driving up this morning in search of a bird that had been found the previous morning by Russell Kokx, I had been present over an hour before I began hearing the continuing vireo singing from just outside the fence at the southwestern corner of the woodlot. I then followed this bird around for most of the next two hours in the hope of getting reasonable views, photos, and audio recordings, albeit with only limited success. Although the vireo sang consistently, it also remained within dense vegetation and it moved extensively, which made it difficult to see even though I knew about where it was most of this time. I never did get more than mediocre views of the bird, generally in bad light and at a distance, but I was able to get a few bad photos and one or two that were reasonably decent. Moreover, despite the rather loud environment, both as a result of the winds and with military jets flying overhead repeatedly, I should have obtained a few reasonably good recordings of the singing bird. Alerting me to its presence, was this bird’s distinctive song, which represented the typical “chip, purweeo-chip” or similar variants on this theme, and which it gave repeatedly, though sometimes separated by short periods of silence during which it would regularly move some distance. I concentrated on getting photos when the bird was at its closest points, which likely contributed to my generally poor views through Zeiss 10 × 42 Victory SF binoculars, so some of my better views were obtained through the viewfinder of a Sony FE 200-600 mm f/5.6-6.3 G OSS zoom lens on a Sony a7RV body. In fact, I saw the pale eyes only through my viewfinder and never through binoculars, through which I had a hard time seeing any feather detail. I may also have heard this bird call a few times, but it was difficult to be sure, especially given that I encountered it more than once in loose association with families of House Wrens (Troglodytes aedon), which were abundant around the woodlot. Over time, I followed the vireo from the southwestern corner of the woodlot north along the west side, and then east along the north side of the property, where I eventually lost track of it. My impression was that this bird was moving almost constantly, and although it remained relatively low, it appeared to spend most of its time between about eye-level and four or five meters above the ground. Nevertheless, some of my better views were obtained when it was higher in the trees, where the vegetation was more open, and the bird was five to seven meters above the ground. This was a relatively small, plump passerine that was clearly a bit larger than the wrens that were in the same area. I never saw it with a warbler, but I suspect it would have been a bit larger and heavier-bodied. I noted that the bill was short, relatively stout, and with a blunt tip, but I was unable to see the finer details of its length or shape. The forehead was sloping and the crown was rounded on a head that appeared to be larger relative to the bird’s size than that of a warbler. I also thought the neck was short and stout, and that the body was plump, full-chested, and larger than that of a warbler. I was unable to discern in the field any structure details of the wings, but the tail was of medium length, roughly comparable to the body without the head and neck, and with a square to jagged tip. I also noted that the posture of the body was approximately diagonal when the bird sang, that the bill was pointed somewhat upward, and that the tail was held downward more strongly than the body and shaken when the bird sang. I saw the legs and feet, but cannot now recall any details about them. My views of the plumage patterns were roughly comparable to those of its structure, but given the often bad light and distance from which my observations were often made, I had a difficult time seeing much detail on a bird that appeared rather worn in appearance. The head appeared rather dingy, but I was unsure whether it was gray or olive, and even though I saw some yellow around the eyes through my viewfinder at one point, I had a hard time seeing this through binoculars. I could see that the back was olive to greenish in color, that it lacked internal markings, and that it contrasted with the sooty-brown wings, but even during my best views I saw no obvious wingbars on coverts that appeared to be rather worn. Even the remiges appeared rather plain, though I thought at least once that the innermost secondaries had paler edges internally. Nevertheless, the wings generally appeared rather dusky and poorly marked, suggesting to me that they were quite worn. I thought the tail was also dark, but on it I was unable to see either the previse color or if it was fringed paler. Although my views were likely better of the underparts than the upperparts, I thought the former appeared generally dingy, but also paler than the upperparts. I cannot recall noting any yellow below on a bird that appeared to be a dingy, light-gray essentially throughout the underparts. I saw no obvious markings below, but the overall appearance was uneven, suggesting that the bird was quite worn. I thought the bill was dark, but I did not see it overly well. I saw the whitish eyes only through my camera viewfinder, but my photos do show a sharp contrast between black pupils and whitish irides. As noted above, my views of the legs and feet were not very good, and as such, my impression that they were dark may not reflect their true coloration.
追加される種
テクニカル・インフォメーション
- レコーダー
- Nagra ARES-BB+
- マイク
- Sennheiserr MKH-20
- アクセサリ
- Roché 30” fiberglass parabola
- オリジナルのファイルサイズ
- 18.66 MB