Experts Tie Pigeon Dung, Bridge Collapse

(AP) -- Pounded and strained by heavy traffic and weakened by missing bolts and cracking steel, the failed Interstate 35W bridge over the Mississippi River also faced a less obvious enemy: pigeons.

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<p><a href="http://www.physorg.com/news107020653.html">Experts Tie Pigeon Dung, Bridge Collapse</a></p> <p>(AP) -- Pounded and strained by heavy traffic and weakened by missing bolts and cracking steel, the failed Interstate 35W bridge over the Mississippi River also faced a less obvious enemy: pigeons.</p>