投稿者
日付
場所
- 年齢
- 指定なし
- 性別
- 指定なし
観察結果の詳細
In this flock were a minimum of three Cackling Geese. Two birds were attached at the hip and traveling together. In a separate part of the flock was this lone Cackler. It was difficult to follow in the flock, easily lost for brief periods, due to its somewhat large size for a CACG and muted upperpart pattern. A closer look revealed a rounded crown with forehead sloping gently into a thick-based bill. This general head/bill shape held up throughout the observation and was not posture-dependent. Its cheek patch lacked the typical hutchinsii-like kink. This combination of features is classic for Taverner’s Goose (taverneri) and helps eliminate the expected Richardson’s form (hutchinsii). Possibly the first record of this taxon in RI? Being a pale-breasted bird, this may indicate that its origin is the Taverner's population from northern Alaska, based on current knowledge.
テクニカル・インフォメーション
- モデル
- Canon EOS 7D Mark II
- レンズ
- EF400mm f/5.6L USM
- ISO
- 250
- 焦点距離
- 400 mm
- フラッシュ
- Flash did not fire, auto
- Fストップ
- f/5.6
- シャッタースピード
- 1/1250 sec
- 大きさ
- 5472 pixels x 3648 pixels
- オリジナルのファイルサイズ
- 701.74 KB