An unexpected side effect of the 2010 flooding  in parts of Sindh, Pakistan, was that millions of spiders climbed up  into the trees to escape the rising flood waters; because of the scale  of the flooding and the fact that the water took so long to recede, many  trees became cocooned in spiderwebs. People in the area had never seen  this phenomenon before. (Courtesy: National Geographic)

An unexpected side effect of the 2010 flooding in parts of Sindh, Pakistan, was that millions of spiders climbed up into the trees to escape the rising flood waters; because of the scale of the flooding and the fact that the water took so long to recede, many trees became cocooned in spiderwebs. People in the area had never seen this phenomenon before. (Courtesy: National Geographic)

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