ML474454821
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
Continuing. Found by Jodi Boe. The task is to eliminate LTJA as the other possibility. Field marks visible in the photos include an apparent Sibley field mark of a pale crescent at base of forehead (pointed out to me by S Aubol) not present in LTJA, the border of the dark cap being less neat than in LTJA, unbarred axillaries which are usually not barred in adult PAJA, more extensive white flash on the base of the dorsal side of primaries than in LTJA. Pale shafts (not to be confused with white primary webs that create the "white flash") on the dorsal side of the primaries usually fewer than 3 in LTJA. This bird shows more than 5. This bird lay prone on the ground while it watched RBGUs feeding in a recently disked field. It regularly flew after gulls, forcing one to surrender its meal, which the jaeger would catch in mid-air and consume. This routine was done three times during the hour that we watched the bird.
テクニカル・インフォメーション
- モデル
- Canon EOS R5
- レンズ
- RF800mm F11 IS STM + EXTENDER RF1.4x
- ISO
- 2000
- 焦点距離
- 1120 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/16.0
- シャッタースピード
- 1/800 sec
- 大きさ
- 2984 pixels x 1989 pixels
- オリジナルのファイルサイズ
- 1.49 MB