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Brood XIII
Periodical cicada brood / From Wikipedia, the free encyclopedia
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Brood XIII (also known as Brood 13 or Northern Illinois Brood) is one of 15 separate broods of periodical cicadas that appear regularly throughout the midwestern United States. Every 17 years, Brood XIII tunnels en masse to the surface of the ground, mates, lays eggs in tree twigs, and then dies off over several weeks.
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Entomologist Charles Lester Marlatt published an account in 1907 in which he postulated the existence of 30 broods. The number has since been consolidated, and only 15 broods of periodical cicadas are currently recognized. Of these, twelve (Broods I through X, XIII, and XIV) are 17-year broods and three (Broods XIX, XXII, and XXIII) are 13-year broods.[1] Brood XI is extinct and Brood XII is not currently recognized as a brood of 17-year cicadas.[2]
The 4 cm (1.6 in) long black bugs do not sting or bite. Once they emerge, they spend their two-week lives climbing trees, shedding their exoskeletons and reproducing. Brood XIII can number up to 1.5 million per acre (3.7 million per hectare). The brood is reputed to be the largest emergence of cicadas known anywhere.[3]
The brood's most recent major emergence occurred during the spring and early summer of 2024, throughout an area roughly enclosed by northern Illinois, eastern Iowa, southern Wisconsin, southeastern Minnesota and a narrow strip of Indiana bordering Lake Michigan and Michigan.[3] A premature emergence occurred in 2020.[4] The brood will emerge again in late May 2041.[2][3][5]