The desert locust (Schistocerca gregaria) is a hairy, six-legged, doublejawed grasshopper whose behavior has been exasperation and puzzling mankind ever since his appearance in Exodus as one of the ten plagues inflicted on Egypt by a wrathful Jehovah. Much of the time he is a normal grasshopper, evenly dispersed and foraging alone. Then suddenly, and at unpredictable intervals, he turns into a mob, blackening the skies like a tornado.
The manic change in his personality is apparently triggered by some violent alteration in his environment, such as sharp fluctuations in temperature or humidity. At such times, he...
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