spiders up trees

Imagine coming across this on a park stroll.

Cobweb trees in Pakistan post flooding 2010 (from Kimberley)

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.