Assertion: cuttlefish's fin | /r/CapableOf | control their buoyancy
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text: Cuttlefish swim by flapping the skirt-like fin that runs around their body and controlling their buoyancy; in times when they need to move more quickly, they suck water in through their gills and squirt the water out of their siphon, a straw-like organ beneath the tentacles, to move by jet propulsion.