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Time Lapse Sand Dollar moving accross the sand

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Uploaded on Nov 24, 2006

This is some Time Lapse video I shot of a very active Sand Dollar moving across the sand in the afternoon. It has a clump of sand on top of it. I have always seen these when I was a kid, but now my fascination with them has really been sparked. The eat plankton and are related to Sea Urchins (they eat sea plants). Some of these Sand Dollars move in a straight line, some go in a circle around and around. Others zig-zag back and forth. I know they seem to have an exoskeleton but WHAT are they? I cant seem to find a lot of detailed information about these creatures and their habits online. Has anyone ever seriously studied the behavior of these creatures? I don't know if they have a brain, but without one, how do they make decisions? Some seem to bury themselves in the sand.

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