— Where's the only place you can deposit your sand...

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montereybayaquarium

Where’s the only place you can deposit your sand dollars? A sand bank!

montereybayaquarium

Sand dollars—flattened urchins adapted to life over shifting ground—use thousands of spines to crawl about and to burrow into the seafloor. 

(Timelapse alert! Every second of the video represents about two minutes in the life of these animals.)