While Utahns have been plagued for more than a week with frozen plumbing and flooded basements, consider the plight of San Francisco Bay Area residents, who have had to make emergency calls to exterminators right after calling their plumbers. California's four years of mild weather has allowed the local Argentine ant population to swell unchecked. The recent cold weather has disrupted their underground nests, so billions of ants have marched indoors seeking warmth, the San Francisco Chronicle reported Thursday.