ML616638421
- 年齡
- 未確定
- 性別
- 未確定
觀察細節
**very rare; SY with retained juv belly. Traffic circle at Field 5. A bit more contrast between very black neck/breast and browner back, fore flanks and apron than expected on a typical adult, but this is attributable to immaturity and date; notably, the retained juv belly is subtly browner and lighter in tone than the formative fore flanks. This also explains why the rearward edge of the apron is slightly less distinct than in typical adult Pacific Black Brant (B. b. orientalis) and superficially suggestive of “Gray-bellied/Lawrence’s Brant” (B. b. nigricans, sensu Delacour and Zimmer 1952 and Buckley and Mitra 2002*)Despite its slightly diffuse rearward edge, the apron extends back well beyond the legs, as in orientalis. Furthermore, the bold and lacy neck collar (especially in a young bird) indicates orientalis. *The type specimen of nigricans, collected by Lawrence in NJ in the mid-18th century is not consistent with Pacific Black Brant, which should thus be referred to as orientalis (the name given to Black Brant breeding in the Russian Far East). Lawrence’s nigricans more closely resembles “Gray-bellied” Brant, which has occurred as a vagrant to eastern NA and Western Europe. https://www.usgs.gov/publications/three-geese-resembling-gray-bellied-brantlawrences-brant-long-island-new-york
技術資訊
- 型號
- iPhone 7
- 鏡頭
- iPhone 7 back camera 3.99mm f/1.8
- ISO
- 20
- 焦距
- 4 mm
- 閃光
- Flash did not fire
- 光圈值
- f/1.8
- 快門
- 1/139 sec
- 次方
- 3628 pixels x 2177 pixels
- 原始檔案大小
- 4.48 MB