communal spider webs in Texas
"At first, it was so white it looked like fairyland," said Donna Garde, superintendent at the park thaty is located about 45 miles east of Dallas. "Now it's filled with so many mosquitoes that it's turned a little brown. There are times you can literally hear the screech of millions of mosquitoes caught in those webs."
Full article: http://scienceblogs.com/grrlscientist/2007/08/spiders_spin_web_the_size_of_t.php