ML378785041
oystercatcher sp. Haematopus sp.
作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
媒体文件注释
Three white-bellied oystercatchers that we could not evaluate with the Jehl Scale due to limited views. The middle of the three appears to be a hybrid and was entered as such. Anacapa Island, CA - 2 Oct 2021
观察细节
We saw three white-bellied oystercatchers on a rock on the south side of the island with a flock of 35 Black Oystercatchers. Our views of these birds were limited as we could not approach the rock closely due to divers in the water. We are only comfortable calling birds "American Oystercatchers" if we can see a combination of features that allows us to score them using the Jehl Scale. In addition to the white bellies, this generally includes seeing the wing stripe, rump, underwings, and undertail coverts. Without an assessment of these features, it is not possible to rule out hybrids which are common among Black Oystercatchers and "frazari" Americans on the Pacific Coast of Baja and Southern California. One appeared to be a hybrid due to black streaking on the flanks. The other two birds were impossible to evaluate with the views we had.
技术信息
- 型号
- Canon EOS 7D Mark II
- 镜头
- EF400mm f/4 DO IS II USM +1.4x III
- ISO
- 400
- 焦距
- 560 mm
- 闪光
- Flash did not fire
- 光圈
- f/8.0
- 快门速度
- 1/500 sec
- 尺寸
- 1500 pixels x 800 pixels
- 原始文件大小
- 1.7 MB