noun
bean goose (Anser fabalis)
A species of goose; the name is usually written in katakana as ヒシクイ. The kanji 菱食 is ateji based on the bird's habit of eating water chestnuts (菱).
ヒシクイは冬に日本へ渡ってくる大型のガンです。
The bean goose is a large goose that migrates to Japan in winter.
田んぼでヒシクイの群れを見つけた。
I found a flock of bean geese in the rice field.
The name ヒシクイ likely derives from 菱 (water chestnut) + 食い (eating), referring to the bird's feeding habits. The exact origin is uncertain.