[["Some emerge every 17 years, while others come out every 13 years. More than one type may emerge in some areas at the same time because of staggered development.", 333.0], ["There are different types of cicadas.\nOne type is referred to as the annual cicadas. These cicadas emerge every year (not in a swarm).\nThe other type is the periodical cicadas. These emerge in a swarm at different intervals ( 17 years or 13 years )", 24.0], ["According to the Chicago Botanic Garden, there are two races of cicadas in the United States, which are distinguished by the time required to develop into adulthood: the 17-year cicadas, which appear in the north, and the 13-year cicadas, which appear in the south.", 2.0]]
how often does cicadas come out
animals,gnats