Find cicadas information at Animal Diversity Web
Cicadas are large, stout insects. They have round bulging eyes on the corners of their heads, and short, bristly antennae. They have sucking mouthparts that attach at the base of their head.
Adults have four wings that they hold folded over their backs like the roof of a house. They also have special panels on the sides of their bodies called "tymbals." They vibrate these very fast to make loud sounds.
Young cicadas are called nymphs. They have no wings, and their front legs have thick claws for burrowing.
Cicadas are found all around the world. They are most diverse in warm regions. We have about 10 species in Michigan.
Cicadas need trees or large woody bushes to feed on when they are nymphs, and soil that is not too wet. They are found in habitats that have warm summers (at least) and these kinds of plants and soil.
Newly-hatched cicadas climb or drop down to the ground from the branch their egg was in. They burrow into the ground and start feeding on the plant juices in roots. As they grow they shed their exoskeleton several times. They sometimes spend many years in the soil before they are finished growing. For some species it takes 13 years, others take 17, and some take less, but nobody knows exactly how long.
When they are mature, they climb out of the ground and complete one final molt. They emerge as an adult cicada with wings, and fly away to find a mate. Once they become an adult they stop growing and do not molt again.
Some of the species that take 13 or 17 years all come out of the ground at one time. There can be millions of adult cicadas flying around at that time.
After mating, females lay eggs in the bark of small twigs. They can each lay dozens of eggs.
Species in the Cicada family don't take care of their offspring.
no parental involvement.
Some species live for 13 or 17 years and all emerge at once. Some come out every year, but nobody knows how long they spend in the ground. Probably at least 3 years.
Adults are active during the day. Very little is known about the behavior of cicada nymphs living in the ground. Cicadas don't usually move far, just to nearby trees. Some species are solitary, some gather in giant groups to mate.
Adult cicadas communicate mainly with sound. Males and female exchange signals, and males will signal to other males too.
Cicadas spend most of their lives sucking juice from the roots of trees. The adults may also suck plant juices from stems.
Pretty much any animal that eats insects will eat a cicada if it can catch one. Cicadas don't have many defenses. Nymphs hide deep in the soil. Adults will fly from danger if they can, and if caught make a very loud buzzing sound that may surprise predators. When millions of cicadas emerge at once, they overwhelm their predators: there are so many that the predators can't eat them all, and many cicadas survive.
Cicadas don't have strong effects on humans one way or another. They can be a nuisance when there are millions of them, and then the sometimes damage the branches of trees when they lay eggs, but usually they don't affect people too much. Some people think they bite or sting, but this is not true.
We don't know of any cicada species that are endangered. Some species may be threatened by the destruction of forests.
Some cicada species make the loudest sounds of any insect in the world.
George Hammond, Animal Diversity Web, University of Michigan Museum of Zoology