ML616731020
Chaetura sp. Chaetura sp.
- 年龄
- 未说明
- 性别
- 未说明
媒体文件注释
Photos showing dark rump.
观察细节
A loose group of swifts with fast direct flight foraging at canopy height along river edge forest. I could never discern any hint of a pale rump through my binoculars in 10 minutes of careful study but light wasn’t great. My mediocre photos also don't suggest any pale coloration on rump. The most distinctive notes in these recordings are the burry/buzzy descending calls (example right at and a little before 0:05). Based on correspondence with Dan Lane, these seem to line up well with Chaetura cinereiventris. Unclear if the swifts I photographed were the ones in the recording. Even in the poor lighting, I would imagine the pale gray rump of C. cinereiventris would have come out in the photos so it might be that the individuals in the photos are not the ones in the recording or that it is really impossible to get diagnostic photos of Chaetura with such poor lighting conditions.
技术信息
- 型号
- Canon EOS R7
- 镜头
- RF100-400mm F5.6-8 IS USM
- ISO
- 5000
- 焦距
- 400 mm
- 闪光
- Flash did not fire
- 光圈
- f/8.0
- 快门速度
- 1/640 sec
- 尺寸
- 2672 pixels x 1291 pixels
- 原始文件大小
- 824.36 KB