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Sand bubbles

These are patterns left on the sand by crabs. From the moment I saw them for first time I kept on wondering what it is. Well, I did a little google research and will share the little information I found....

 

They are Sand bubbler crabs that live on sandy beaches in the tropical Indo-Pacific.

These small crabs live in burrows in the sand, where they remain during high tide. When the tide is out, they emerge on to the surface of the sand, and scour the sand for food, forming it into inflated pellets, which cover the sand. The balls are actually the left overs after feeding.

The crabs emerge as soon as the tide recedes. You can almost tell how long the tide has been out by the patterns of their sand balls. The more intricate the pattern of sand balls, the longer the tide has been out.

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Uploaded on August 3, 2010
Taken on June 21, 2010