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 Cicadas are very strange insects they make this buzzing sound and if there are more than on its defining so cycads it is when they spawn they are in the tree some swarms can get over millions of cicadas which is crazy than they go into the dirt and feed off the juices in the roots of the trees after that they fly up the tree and mold so they can mate by the way cidas only make that buzzing sound when they are trying to mate and for other reasons too but that is their main reason at our old house you could hear them everywhere we hated it.