ML587586131
作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
- 标签
- 蛋; 巢
观察细节
First observation at 0541. 60 counted on property. 18 individual(s) singing. Additional breeding codes: A, CF, NE, FL Lots of alarm calls and upset behavior while I was walking through reaches 4 and 3. Flushed a female from a nest on a bench above the creek near the east end of reach 4; the nest was placed among Agropyron intermedium stems and had four RWBL eggs plus 1 BHCO egg. Also saw a female carrying food (grasshoppers). Most individuals in reaches 4 and 3, plus a few (approx. 4) around the constructed wetland upstream in reach 2. It has been hard to get robust counts of RWBL over the last few years - it's hard to keep track of all of them! Today I tried a new strategy, picking a landmark ahead of me and counting all males and females between me and that landmark, then extending my counting area out to the next landmark once I reached the first. This method appeared much more robust to me than prior methods, which have probably underestimated abundance; at least on this day, males seemed fairly stationary in their territorial perches, without excessive movement upstream or downstream while I counted.
技术信息
- 型号
- Pixel 4a
- 镜头
- Pixel 4a back camera 4.38mm f/1.73
- ISO
- 62
- 焦距
- 4.4 mm
- 闪光
- Flash did not fire
- 光圈
- f/1.7
- 快门速度
- 833/50000 sec
- 尺寸
- 4032 pixels x 3024 pixels
- 原始文件大小
- 901.28 KB