Mall of America welcomes 72,000 ladybugs

"The Bloomington, Minn., mall, which is so huge it could hold seven Yankee Stadiums, also has more than 30,000 live plants, including about 400 trees, which act as natural air purifiers for the indoor mall. But aphids -- the pesky insects that feed on plants -- thrive inside the Mall of America's many landscaped areas." [Discovery]