ML616731020
Chaetura sp. Chaetura sp.
投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
視聴覚メディア・ノート
Photos showing dark rump.
観察結果の詳細
A loose group of swifts with fast direct flight foraging at canopy height along river edge forest. I could never discern any hint of a pale rump through my binoculars in 10 minutes of careful study but light wasn’t great. My mediocre photos also don't suggest any pale coloration on rump. The most distinctive notes in these recordings are the burry/buzzy descending calls (example right at and a little before 0:05). Based on correspondence with Dan Lane, these seem to line up well with Chaetura cinereiventris. Unclear if the swifts I photographed were the ones in the recording. Even in the poor lighting, I would imagine the pale gray rump of C. cinereiventris would have come out in the photos so it might be that the individuals in the photos are not the ones in the recording or that it is really impossible to get diagnostic photos of Chaetura with such poor lighting conditions.
テクニカル・インフォメーション
- モデル
- Canon EOS R7
- レンズ
- RF100-400mm F5.6-8 IS USM
- ISO
- 5000
- 焦点距離
- 400 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/8.0
- シャッタースピード
- 1/640 sec
- 大きさ
- 2672 pixels x 1291 pixels
- オリジナルのファイルサイズ
- 824.36 KB