The Sand dollars are species of flattened, burrowing sea urchins belonging to the order Clypeasteroida.

That shifting underside is made up of thousands of 'tube feet' used for mobility.

https://video.nostr.build/4dde0693f61d851e85a0ec1ec2bee88c7e44745ed6089b9aa5a8b70bdec28bf1.mp4

#sea #animals #amazing #videos #nature #rare

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Feels creepy when you hold it in your palm, too!