滤食动物是以过滤方式摄食水中浮游生物的动物，包括主动滤食者和被动滤食者两类。
牡蛎是一种滤食动物，这意味着它们能够帮助清洁水。
Oysters are filter feeders which means they help clean the water.
同样的道理，类似蛤和虫这样的滤食动物在大部分区域都埋在地下。
For the same reason, filter feeders, like clams and worms, burrow underground in most regions.
这次大灭绝之前，海洋动物大部分是固定在海底的滤食动物，比如海百合。
Before this extinction, Marine animals were mostly filter feeders stuck in place on the seafloor, such as crinoids or "sea lilies."
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