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tarponchik

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Hawaii, Kona coast, at about 25 ft. Looked soft and moved with the waves. The whole cluster size was about 2"-2.5" across. Could this be someone's eggs?
DSC02093-1.jpg
 
IDK if they're endemic to Kona but that looks similar to certain Whelk egg cases I've seen elsewhere.
 
https://www.shearwater.com/products/peregrine/

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