ML643420788
作者
日期
地点
- 年龄
- 未说明
- 性别
- 未说明
媒体文件注释
Elaenia parvirostris/albiceps
观察细节
A confusing bird. No calls heard, no white seen in crown, and playback not attempted. I initially considered parvirostris and albiceps (chilensis), but it appears to have features intermediate between the two. Features that point to albiceps (chilensis): - wide dark bar at base of secondaries - relatively long primary projection (I estimate it as 2:1) - lack of sharp contrast between neck sides and throat, generally brownish underparts Features that point to parvirostris: - appearance of a third wing bar in lesser coverts. This is said to be “perhaps the most important feature for differentiation from Chilean” by Gorleri and Areta (2022) - rounded head shape - base of lower mandible pinkish (also ok for adult Chilean) On further consideration, provisionally identifying as mesoleuca, although I'm having trouble finding consistent ID information for that species, and I suspect some of the photos on eBird and elsewhere may be wrong, as they show individuals with quite different features from each other (e.g. the cover photo in Birds of the World). Nevertheless, I see photos labelled as mesoleuca with all of the features mentioned above (e.g. https://macaulaylibrary.org/asset/267009091; https://www.wikiaves.com.br/4062230). E. mesoleuca is usually found at higher elevations, but according to van Perlo can occur to sea level and is migratory in southern part of range, so this could be a migrant bird. Additional features that point to mesoleuca: - extensive brownish on breast and underparts - lack of any white observed in crown (although that could be because it was not excited) - although Birds of the World states that this species is separated from parvirostris by having two wingbars rather than three, and van Perlo shows it with two, Ridgley et al. say 2-3 bars, and many of the photos labelled as mesoleuca show three I'm open to other suggestions
技术信息
- 型号
- NIKON D600
- 镜头
- 300.0 mm f/4.0
- ISO
- 250
- 焦距
- 300 mm
- 闪光
- Flash did not fire
- 光圈
- f/4.0
- 快门速度
- 1/500 sec
- 尺寸
- 1328 pixels x 884 pixels
- 原始文件大小
- 165.24 KB