ML605819441
投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
観察結果の詳細
[TAB notes] As we were watching several Least-Storm Petrels flying around about 20-30 meters off shore, I noticed a white-rumped bird among the group, joined several minutes after by a second. These two birds were very accommodating, making several close passes by the shore where we were standing, allowing excellent views and photo opportunities, as well as direct comparisons with Least Storm-Petrels. There birds had obvious bold white rumps (upper tail coverts) wrapping around the sides of the rump and extending on the lateral edges of the under tail coverts, contrasting with the blackish color of the remainder of the plumage. The anterior edge of the white rump was straight while the posterior edge tapered to a point, forming a more or less triangular shape to the white rump patch that extended most of the way to the tail. They were the same size or only very slightly larger than the Least Storm-Petrels, and flew with the same direct flight and deep wing strokes as that species. The outer-most tail feathers were slightly longer than the inner tail feathers, so the tail appeared either squared-off or widely notched, but was not forked. Based on other reports of storm-petrels from California, Arizona, and Nevada, this appears to be the dominant (perhaps only) species of white-rumped strom-petrel associated with the avian fallout from Hurricane/Tropical Storm Hilary. We scanned the flock multiple times very carefully attempting to obtain accurate counts and came up with a total of 15 storm-petrels including three Wedge-rumpeds and 12 Leasts.
テクニカル・インフォメーション
- モデル
- Canon EOS R7
- レンズ
- EF100-400mm f/4.5-5.6L IS II USM
- ISO
- 400
- 焦点距離
- 349 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/6.3
- シャッタースピード
- 1/2500 sec
- 大きさ
- 1253 pixels x 969 pixels
- オリジナルのファイルサイズ
- 284.76 KB