ML361923771
- 年龄和性别
- 成年雌鸟 - 1; 成年雄鸟 - 1
- 行为
- 觅食或者进食
媒体文件注释
Foraging Long-billed Dowitchers at Weskeag Marsh, Knox Co., Maine. Digiscope through Leica scope with iPhone.
观察细节
Two adult Long-billed Dowitchers were foraging in the deeper and larger near pool, almost always belly deep in water. These being adult dowitchers and showing reddish on the underparts to the undertail coverts--much patchier and paler already on the larger, assumed female, of the two--was one clue to species identification. I noted the bill length of the larger bird was well beyond anything a Short-billed would show. The faces were grayer and the necks a bit duller and apparently finely spotted. Looking closely, I noted short bars at the breast sides, this helpful in eliminating Short-billed. The tail pattern suggest Long-billed, having dark bars broader than the pale bars, which were tinged rufous. In flight, at least one bird appeared to be commencing wing molt (inner primary "notch" visible). One bird had probably molts some of its underparts, and both appear to have new and molted scapulars and maybe wing coverts. I never heard the birds. A single bird was seen here last on 8 August, and then one was seen 13 August. Then today two were present. I think that the earlier bird is a different bird, and today's are two new birds. One of these and maybe both appeared to show start of wing molt (inner primaries). As for species identification based on body shape, I think it is plainly obvious that female Long-billed Dowitchers are perhaps obviously more rotund and hunched looking. But many observers try to apply this subjectively to all birds, and some Short-billed can appear this way (females?). But female Long-billed are rather obvious based on bill length. See videos showing male--not so hunched back--and female. These comparative characters are not as secure as plumage pattern and call.
技术信息
- 相机
- iPhone 12 pro
- 话筒
- 附件
- 原始文件大小
- 139.19 MB