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Why Do Cicadas Come Out Every 17 Years?

Answer

There are two types of cicadas, dog day and periodical cicadas. Dog Day cicadas come out every July and August in small numbers. Periodical cicadas stay underground until they are ready to change into adults. The life cycle of the periodical cicada is 17 years and that is why they come out every 17 years. Cicadas all come out at once so that predators tire of eating them, and can't eat all of them so enough survive. Cicadas are not poisonous and usually emerge when the ground temperature rises above 64 degrees.
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Q&A Related to "Why Do Cicadas Come Out Every 17 Years?"
Seventeen's a prime number, so emerging every 17 years makes it harder for predators to sync their boom-bust cycles to that of the cicadas. The other notorious periodical cicada has
http://www.quora.com/Why-do-cicadas-peak-every-17-...
http://www.chacha.com/question/what-makes-cicadas-...
Cyclics differ for species, some at 3 to 5 years, while others are on a 13 to 17 year cycle. Most opinions point at predation as a major factor for the long term. No hibernation,
http://answers.yahoo.com/question/index?qid=201304...
Periodical Cicadas. Cicada juveniles are called "nymphs" and while living that 13 or 17 years underground, they suck root fluids for food. So they are not in "hibernation
http://wiki.answers.com/Q/How_do_periodic_cicadas_...
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