Originally posted by goatsNdonkey I believe there are some annual cicadas, at least in some places, but they don't appear in the droves we see with the periodic ones. The gigantic swarms of the periodic ones are a great adaptation for overwhelming any predatory pressures on their varieties.
In the south of Brazil where I grew up we had the yearly cicadas. At least they made lots of noise every year, and were never in droves... in our German community we called them Weihnactskäfer because, of course, they sing during the Christmas season (no relation to the Australian Christmas Beetle...)