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Chimney Swift Roost--Downtown Raleigh
Wake, North Carolina, United States
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Mapa Coordenadas: 35.7786554, -78.6404747
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No especificado
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Volando
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Recorded 19:22 EDT as they were entering a roost chimney and swirling around; over 3,000 CHSW present.

Detalles de la observación

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.

Información técnica

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