Bivalve gills, also called ctenidia, are made of many fine filaments, which are covered by countless microscopic cilia. The cilia are triggered to beat when the bivalve smells something nice, causing water to flow past. The cilia stick to tasty particles and pass them down towards the mouth like an assembly line!

An electron microscopic view of a mussel gill filament covered by cilia, bifurcated and covered with hairs
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