noun
moorhen; waterhen; gallinule
Refers to the common moorhen (Gallinula chloropus), a waterbird found in wetlands. Usually written in katakana as バン.
池でバンが泳いでいるのを見た。
I saw a moorhen swimming in the pond.
The Japanese name バン is likely derived from the bird's call or an onomatopoeic representation. The kanji 鷭 is a kokuji (Japanese-created character) combining 鳥 (bird) and 番 (watch/guard), but the exact origin is uncertain.