Periodical cicadas come out every 13 or 17 years. And the scientific community that is interested in this sort of thing has labelled the batches. This year they were expecting Batch VI in Virginia but they were surprised to see Batch X emerging as well, four years early. We only saw about 6 all up, so I presume the rest will come out on time.
The conjecture is that it is about a warmer earth temperature, making the nymphs grow faster to their adult size. Whether any manage to mate and lay more eggs (or if they all got eaten) is apparently going to be answered in about 17 years.
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