National Geographic News
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Angga Kurniawan
Angga Kurniawan

Many first-time visitors to Jean Lafitte National Historical Park and Preserve were surprised to see mysterious structures made of mud on the forest floor. "These interesting formations, which are commonly known as crawfish chimneys, are created when a crawfish digs its burrow," according to Bolt.

"While their function isn't entirely understood, a common belief is that it serves to protect and conceal the animal's underground chamber," he added. http://goo.gl/t1Vgwr

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