![]() Those in the air will likely be closed up.Īt the aquarium, Chandler said they are fed brine shrimp, although they normally eat plankton in the wild. Even so, it's more common to be able to hear that odd grinding noise while they're still under the thin layer of sea water you find at a tide pool. You can see the acorn barnacles at the Seaside Aquarium, although they are underwater and not poking out of a tide pool – so you won't be able to hear them at the facility. Part of the interest here is that they reach out and grab stuff with that feathery appendage, then plopping it in the barnacle's mouth. They stick their little fan thingy out to grab the plankton. “They feed on plankton when the tide is high,” Chandler said. So it's possible even just moving around a tide pool area freaks them out and causes them to get nervous. Acorn barnacles will clam up and dart into their shells when even just a shadow passes over them. It doesn't take much to disturb them, either. If something pokes your eye, you're going to move your head around.” “It happens when they twist around inside their shells,” Chandler said. You can see them squirming around in there. Keith Chandler, manager of Seaside Aquarium, said the acorn barnacle has two shells that it lives inside. The noise comes from the tiny creatures moving around inside their shells. ![]() Mostly made by what are called acorn barnacles, they can be made by volcano barnacles as well. It's barely audible, but it's described as a grinding or clicking noise. ![]() Oregon coast tide pools are always full of trippy new discoveries, but this will likely be a memorable one. (Oregon Coast) – One wacky little surprise that possibly awaits you on the Oregon coast is the wild sound of “talking barnacles.” More correctly, it's a faint grinding noise they make and if you encounter a lot of them doing it, it may sound like they're all chattering among themselves. The Wild, Weird Phenomenon of Talking Barnacles on Oregon Coast
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