Monday, May 21, 2007

Swarms of cicadas

These undated photos show the emergence of the periodical cicada. From left: the cicada molts from nymph to adult; in teneral stage, wings expanded, while its new exoskeleton hardens, and a red-eyed adult, skin hardened.

Coming soon: Brood XIII. It sounds like a bad horror movie. But it’s actually the name of the billions of cicadas expected to emerge this month in parts of the Midwest after spending 17 years underground.

The red-eyed, shrimp-sized, flying insects don’t bite or sting. But they are known for mating calls that produce a din that can overpower ringing telephones, lawn mowers and power tools.

Brood XIII is expected across northern Illinois, and in parts of Iowa, Wisconsin, Michigan and Indiana. Cicadas live only about 30 days as adults, and their main goal is mating.