ML179592111
投稿者
LynnErla Beegle この投稿者による視聴覚メディア プロフィール
日付
場所
Chimney Swift Roost--Downtown Raleigh
Wake, North Carolina, United States
この場所の視聴覚メディア 図解チェックリスト- 年齢
- 指定なし
- 性別
- 指定なし
- タグ
- 生息環境; 鳥がいない
視聴覚メディア・ノート
No Chimney Swifts visible - just the habitat (roost chimney), satellite view, 215 S McDowell St, Raleigh, Wake, NC. Note the small hole compared to the large chimney; it's amazing that they pour into this so rapidly!
観察結果の詳細
Conservative estimate, based on counting 100x100 of swirling flock. The swifts entered the chimney at 215 South McDowell (News & Observer) from 7:14 until 7:30. About 10 per second entered the chimney over a period of 15 minutes. There were breaks in between where they were swirling, so another estimate was based on 500 birds entering the chimney per minute for a total of 7 active minutes. They started the entry at 7:14 and the last bird entered at 7:30.See photos.
テクニカル・インフォメーション
- 大きさ
- 718 pixels x 520 pixels
- オリジナルのファイルサイズ
- 137.57 KB