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Spikey little blue thing! Bigger than a dime, smaller than a quarter


Low tide, just under the water. Lots of mud flats inside the reef here.There were many of them. I put a stick out near it to see if it would react or grab it. when the stick got close it sucked itself into the mud and out of sight.

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Hawaii, USA

Spotted on Apr 27, 2016
Submitted on Apr 27, 2016

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