ML51083871
投稿者
日付
場所
- 年齢と性別
- 成幼不明、オス - X
観察結果の詳細
Many mallard traits you list above are found in formative Hawaiian Duck males. The black tail and curl included. This bird is phenotypically a Hawaiian Duck. Speculum color ranges from emerald green to blue in Hawaiian Duck. From a genetics standpoint there are birds on Oahu with posterior genetic assignments as .95 Hawaiian Duck. The eye ring is age related being bolder as the bird ages. Hawaiian Duck is unique among Anas ducks in males having a distinct immature (formative) plumage that can incorporate a number of mallard traits. No two birds can be the same. Most of those birds are incorrectly dubbed hybrids. They are not. Much of this variation is lost after the birds second prebadic molt, becoming the brown duck so well know. This plumage change is genetic but driven by hormones. Bottom line is that this bird is well within the norm for Hawaiian Duck, and there are many on Oahu that are similar. Reexamining the tail, this is typical of adult male Hawaiian Ducks, including the semi curl. - Andy Engilis, UC Davis ornithologist studying Hawaiian Ducks
テクニカル・インフォメーション
- モデル
- NIKON D300
- ISO
- 1600
- 焦点距離
- 380 mm
- フラッシュ
- Flash did not fire
- Fストップ
- f/10.0
- シャッタースピード
- 1/3200 sec
- 大きさ
- 3803 pixels x 2260 pixels
- オリジナルのファイルサイズ
- 7.44 MB