June 28, 2002 9:22 AM Subscribe
Periodical cicadas, the 13-year and 17-year varieties made up of 23 separate broods, sometimes emerge concurrently, as they did in Missouri in 1998. The result of their combined mating calls is a cacaphony. There are many different varieties of calls: those by Magicicada cassini, Magicicada septendecim and Magicicada septendecula are just a few. Brood XXIII is due this year. The prime numbers of the two cycles make it difficult for predators to evolve matching breeding cycles. More cicada links.
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