棲息於河流或湖泊底部的軟體動物。利用堅硬的外殼過濾水分以獲取食物，遇到威脅時會迅速閉合以保護自身。
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.
棲息於河流或湖泊底部的軟體動物。利用堅硬的外殼過濾水分以獲取食物，遇到威脅時會迅速閉合以保護自身。
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.