The Dr. Jekyll to Mr. Hyde transformation took only a few hours.
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It turns out that locusts produce more serotonin when circumstances force them together and they are stimulated by the sight, smell and touch of many other locusts. This can happen, for example, when drought reduces their food supply and causes locusts to gather at a few remaining sources of food.
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Indeed, the scientists found that tickling the insects' back legs for a couple hours could induce the locusts to make more serotonin.
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Once researchers determined that serotonin causes the change, they gave locusts drugs that blocked serotonin and then exposed them to situations that normally cause swarming. But the change didn't occur.
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"To actually be able to stop it from happening, that was very exciting," Anstey said.
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Now the question is how to target locusts without affecting humans or other animals.