作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
观察细节
In this flock were a minimum of three Cackling Geese. Two birds were attached at the hip and traveling together. In a separate part of the flock was this lone Cackler. It was difficult to follow in the flock, easily lost for brief periods, due to its somewhat large size for a CACG and muted upperpart pattern. A closer look revealed a rounded crown with forehead sloping gently into a thick-based bill. This general head/bill shape held up throughout the observation and was not posture-dependent. Its cheek patch lacked the typical hutchinsii-like kink. This combination of features is classic for Taverner’s Goose (taverneri) and helps eliminate the expected Richardson’s form (hutchinsii). Possibly the first record of this taxon in RI? Being a pale-breasted bird, this may indicate that its origin is the Taverner's population from northern Alaska, based on current knowledge.
技术信息
- 型号
- Canon EOS 7D Mark II
- 镜头
- EF400mm f/5.6L USM
- ISO
- 250
- 焦距
- 400 mm
- 闪光
- Flash did not fire, auto
- 光圈
- f/5.6
- 快门速度
- 1/1250 sec
- 尺寸
- 5472 pixels x 3648 pixels
- 原始文件大小
- 701.74 KB