LINCOLN, Neb. (AP) — It’s that time of the century again, when cicadas (sih-KAYE’-duhs) emerge and raise their racket.

This year the Kansas brood, which experts say is one of 12 cicada broods across the country, will come to adult life in part of eastern Nebraska, including Cass, Cuming, Douglas, Johnson, Otoe, Pawnee, Sarpy and Saunders counties.

Some species emerge every year, but others follow life cycles of three, seven, 13 and 17 years — all prime numbers.

University of Nebraska-Lincoln bug expert Leon Higley said the theory is that cicadas have life cycles corresponding to prime numbers so predator species have difficulty synchronizing their life cycles with the cicada life cycles.