ML473701501
作者
Christian Walker 该用户提供的媒体文件 档案
日期
地点
Porcupine Springs
Cassia, Idaho, United States
该地点产生的媒体文件 配图名录- 年龄
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观察细节
Great looks at an immature and male. Calling flight calls clearly lower than RECR Type 2. Recorded, pics, vid. Look like normal crossbills male all red with forked tail no wing bars. Crossed bill. Imm all pale gray brown with some streaking and slightly paler rump. Did a little research with the help of Matt Young's article https://ebird.org/news/crossbills-of-north-america-species-and-red-crossbill-call-types/ and you can see the lower frequency of these birds (the main component is in the 3-3.5 kHz range as opposed to Type 2 RECR which is normally higher - highest part at 4.5 kHz). Also can see a little of the upward component of the first part which is absent in Type 2.
技术信息
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- 原始文件大小
- 28.14 MB