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It’s a jellyfish.

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And what you’re looking at is kind of on its side.

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And the tentacles, instead of trailing behind it, the mouth of this thing would be on the left side, inside of that bell that you see squeezing.

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And the way they swim is by squeezing that bell.

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But they have the tentacles oriented on the upper side to intercept whatever it is that they encounter as they move.

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And you can see the motion of that bell structure, there some cool, actually, bio pneumatic it’s called,

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robotic modeling where people have built robots that swim like jellyfish

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because it’s actually a very effective way to move through the water.

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Absolutely. It’s a form of jet propulsion. You’re taking in some water and then squeezing it out through a smaller opening,

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which is what gives you the propulsion to move in the opposite direction.