Why do little beach crabs create patterns of sand balls?

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3 thoughts on “Why do little beach crabs create patterns of sand balls?”

  1. i cheated and used google:

    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 radial 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.

  2. They certainly are energetic little buggers. Perhaps they wouldn’t need so much food if they’d relax more.

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