noun
northern pintail; Anas acuta
A migratory duck species with a long, pointed tail; common in Japan during winter.
冬になると、オナガガモが湖にやって来る。
In winter, northern pintails come to the lake.
The name オナガガモ literally means 'long-tailed duck', from 尾長 (long tail) and 鴨 (duck).