ML407118661
作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
观察细节
In this breeding plumage, the Western Gull and Slaty-backed Gull are the only possible birds, but Slaty-backed has never been recorded in Arizona. Both birds have pink legs, rather thick and heavy bills (Western heavier), and both also have broad tertials and a drooping "white skirt" (Sibley) on the secondaries. As shown in the pictures, Western usually has a darker iris (sometimes clear however), while in Slaty-backed it is usually clear to dirty yellow. But based upon these photos, what really nails this down as a Western is the underwing in flight, which has more visible black from below than a Slaty-backed. Slaty-backed would also have noticeable white subterminal spots, something that Western does not display as shown in these pictures. Very Rare: 3rd Arizona record.
技术信息
- 型号
- VideoCam Suite
- 尺寸
- 701 pixels x 398 pixels
- 原始文件大小
- 118.33 KB