Note: Once every 17 years in places throughout North America, the 17-year cicadas emerge en masse from their long hibernation in the soil having quietly fed on the roots of deciduous trees, 1.5 million per acre, and take to the trees, percussing their abdomens, mating, laying eggs, and dying, falling to the soil to fertilize the trees whose juices have long been their sustenance. While scary in sight and sound, they actually do not damage the trees or plants as locust swarms would.
Note 2: the traditional haiku has seventeen syllables.