Siphons of octopi, squid, and cuttlefish jet through the water with directional control via jet propulsion.

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"Octopuses, squid, and cuttlefish have a more sophisticated version of jet propulsion. They expel water through a moveable tube called a siphon, which combines power with directional control." (Downer 2002:17)

Weird Nature: An Astonishing Exploration of Nature's Strangest BehaviorMarch 2, 2002
John Downer

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