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While these arrays of balled-up sand may look like the work of a nimble-handed artist, they're actually just the remnants left behind where a sand bubbler crab's been snacking. During low tide, the diminutive species, averaging less than a half-inch across, exit their burrows to scour the sand for tiny bits of organic debris in a radiant motion. While eating, the crabs ball the excess sand on their heads, then discard it when it gets too big for them to see over -- leaving behind a remarkable-looking reminder which helps them keep from searching for food in the same sand twice.
Originally posted by Casandra
Here, I embedded it for you.
This is awesome!