<P> Cicadas have prominent eyes set wide apart , short antennae , and membranous front wings . They have an exceptionally loud song , produced in most species by the rapid buckling and unbuckling of drumlike tymbals . The earliest known fossil Cicadomorpha appeared in the Upper Permian period ; extant species occur all around the world in temperate to tropical climates . They typically live in trees , feeding on watery sap from xylem tissue and laying their eggs in a slit in the bark . Most cicadas are cryptic , singing at night to avoid predators . The periodic cicadas spend most of their lives as underground nymphs , emerging only after 13 or 17 years , which may reduce losses by starving their predators and eventually emerging in huge numbers that overwhelm and satiate any remaining predators . The annual cicadas are species that emerge every year . Though these cicada have life cycles that can vary from one to nine or more years as underground larvae , their emergence above ground as adults is not synchronized so some appear every year . </P>
<P> Cicadas have prominent eyes set wide apart , short antennae , and membranous front wings . They have an exceptionally loud song , produced in most species by the rapid buckling and unbuckling of drumlike tymbals . The earliest known fossil Cicadomorpha appeared in the Upper Permian period ; extant species occur all around the world in temperate to tropical climates . They typically live in trees , feeding on watery sap from xylem tissue and laying their eggs in a slit in the bark . Most cicadas are cryptic , singing at night to avoid predators . The periodic cicadas spend most of their lives as underground nymphs , emerging only after 13 or 17 years , which may reduce losses by starving their predators and eventually emerging in huge numbers that overwhelm and satiate any remaining predators . The annual cicadas are species that emerge every year . Though these cicada have life cycles that can vary from one to nine or more years as underground larvae , their emergence above ground as adults is not synchronized so some appear every year . </P>
what are the bugs that buzz in the trees
what are the bugs that buzz in the trees
Cicadas
Cicadas