作者
Andy Wilson NFC Station 该用户提供的媒体文件 档案
日期
地点
Tuscarora Creek Development
Frederick, Maryland, United States
该地点产生的媒体文件 配图名录- 年龄
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媒体文件注释
better spectrogram. First is a seventh bird from 12-1am hour on 25th. The other four are four of six in this checklist.
观察细节
(NFC 9) at 21:20, 21:22, 21:27, 21:39, 21:44, 21:56. All look like classic Bicknell's to me!! All but 1 have peak frequency well over 5 kHz, one just shy. Also note the distinctive shape with a sharp angle between upward and downward parts of he call. Strong (unprecedented) inland movement of shorebirds over Frederick this night suggests a westward shift in "coastal" species movements? See this for spectrogram comparisons of Bicknell's/Gray-cheeked.
技术信息
- 原始文件大小
- 983.73 KB