川や湖の底に体を埋めて生息する軟体動物。硬い殻の中で水を濾過して獲物を取り、危険を感じると素早く口を閉じて身を守る。
A mollusk that lives buried in the bottom of rivers or lakes. Inside its hard shell, it sifts water to obtain food, and when threatened, snaps shut tight to keep itself safe.
川や湖の底に体を埋めて生息する軟体動物。硬い殻の中で水を濾過して獲物を取り、危険を感じると素早く口を閉じて身を守る。
A mollusk that lives buried in the bottom of rivers or lakes. Inside its hard shell, it sifts water to obtain food, and when threatened, snaps shut tight to keep itself safe.