And so are filter feeding basking sharks!

滤食性姥鲨也是如此！

Why filter- feeding sharks exhibit this behavior is not known.

为什么滤食性鲨鱼表现出这种行为尚不清楚。

That's because they have simple body plans – essentially tube-like structures that filter feed – and they have relatively few types of cell.

这是因为它们的身体结构简单，本质上是过滤饲料的管状结构，并且它们的细胞种类相对较少。

Feather duster worms are a type of tube worm that dig down into the substrate and filter feed above it with their enormous feathery tentacles.

鸡毛掸子蠕虫是一种管状蠕虫，它们用巨大的羽毛状触须深入基质并过滤上方的饲料。

And one more big thing that set Placoderms apart from earlier fish was that they were the first fish to have jaws, giving them the ability to bite, chew, and grind rather than just scrape or filter feed.

盾皮鱼有别于早期鱼类的另一大特点是它们是第一批拥有下颌的鱼类，这使它们能够咬、咀嚼和研磨，而不仅仅是刮取或过滤饲料。