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17 Year Cicada: 17 Year Cicadas - Both of them are called so due to the incredible capability: they merge by million noisy adults within a few hours after their silent staying underground during 13 or 17 years! No comments, indeed.
For the sake of reference convenience, each brood is marked by a Roman numeral. Thus, I-XVII refer to the 17-year-old broods, but XVIII-XXX - to the 13-year-old broods. Brood I started in 1893. Consequently, there are 13 broods of a 17-year-old cicada and 5 broods of a 13-year-old cicada.
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