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CicadaYear.com: cicadas are between 2 and 5 cm (1 to 2 inches) long. Cicadas have prominent eyes set wide apart on the sides of the head, short antennae protruding between or in front of the eyes, and membranous front wings. Some cicadas produce sounds louder than 100 dB! They modulate their noise by wiggling their abdomens toward and away from the tree that they are on. Some species have 17 year life cycles, e.g. the Magicicada, which is widespread in the USA.

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Cicada Takeoff
cicada
Act One was self-explanatory. Hibernating cicada nymphs emerged from the ground and crawled around.

Act Two also was straightforward. They molted and left behind a diaphanous, buggy husk. They began to fly.

Act Three, the Washington region has learned over the past week or so, is more mysterious and complex, something you almost have to experience to understand. Words seem inadequate to describe that vaguely menacing hum-whistle that seems to be everywhere but emanates from no single place in particular.

Hollywood imagery helps.

"It feels like an alien spaceship coming in," said Arlington resident Gene Miller, 66.

"You ever watch that old 'Star Trek' episode where they leave their phasers on and try to melt something?" asked George Fox of Alexandria. "That's what it sounds like to me."



Read More: http://www.washingtonpost.com/wp-dyn/articles/A4917-2004May31.html