ML85673591
- 年齡
- 未確定
- 性別
- 未確定
觀察細節
a very rough and highly conservative estimate based on sampling of birds close enough to identify easily. In about 20 rough samples of 100 or so birds, I only failed to find any LESC on one or two occasions, whereas the proportion of LESC was above 5% on more than half and close to 10% on a few. These samples were taken at widely varying places within a relatively near flock of ca. 10,000, yielding an estimate of ca. 500 LESC for this flock alone. I did not extrapolate this proportion to the more distant flocks without direct evidence that these contained comparable numbers of LESC, but I would be surprised if they did not. Thus it is likely that 2000-3000 LESC were present. Several LESC visible in each photo.
技術資訊
- 型號
- Canon PowerShot S90
- ISO
- 80
- 焦距
- 6 mm
- 閃光
- Flash did not fire, auto
- 光圈值
- f/4.0
- 快門
- 0.01 sec
- 次方
- 2653 pixels x 1591 pixels
- 原始檔案大小
- 763.55 KB