Cicada 2024 Facts4u. Illinois may well be the cicada capital of the united states this spring when millions of the large, loud insects. One of the most peculiar of north america’s natural wonders — the synchronized mass mating frenzies of big, obsessed insects called periodical cicadas — is playing out.

Enough separate clicks coalesce into a surprisingly loud sound known as the cicada. With spring in full swing, a subterranean clock is ticking in more than a dozen states.