Prime lifespans help to avoid lifespan synchronization with predators. But resonance is important too.
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I remember collecting them and their shells as a kid.
With names like Green Grocer, Cherry Nose and Double Drummer[2], the hunt was always on for how many different types could be found over the summer.
[1] https://www.cicadamania.com/cicadas/tag/c-australasiae/
[2] https://www.cicadamania.com/cicadas/australian-cicada-names/