ML581821131
投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
- 行動
- 飛んでいる; 換羽
観察結果の詳細
One bird I was unsure of in the field but became more convinced of after viewing my photos. Structurally smaller, stockier, and shorter tailed than surrounding Streptoprocne (including rutila), being much closer to a Chaetura in structure. However, it has the large-headed look typical of a Cypseloides, and a clearly squared tail. Shorter-tailed, too, than a Cypseloides niger, and with shorter wings. Interestingly, this bird was in active wing molt, with most secondaries growing in, which agrees on molt timing with some other photos on Macaulay of storeri in molt around this time of year, but I'm unable to find any photos of C. niger in wing molt in Mexico (or in the USA). The first photo does show a faint pale area behind the eye, but it lacks the large white front, so it doesn't appear to be an adult male. Perhaps a female? I would imagine a juvenile would have some white scaling on the belly, which this bird doesn't seem to show.
テクニカル・インフォメーション
- モデル
- Canon EOS REBEL T5i
- レンズ
- EF300mm f/4L IS USM
- ISO
- 100
- 焦点距離
- 300 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/5.0
- シャッタースピード
- 1/1000 sec
- 大きさ
- 787 pixels x 525 pixels
- オリジナルのファイルサイズ
- 30.98 KB