Locust Swarms Devastate Agriculture In East Africa

Swarms of locusts are devastating agriculture in East Africa 
and threatening food security in the region. 
They number in the billions and when they settle in one area, 
you know how devastating that would be, 
consuming most of the green vegetation around. 
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According to https://en.wikipedia.org/wiki/Locust, 
locusts are the swarming phase of certain species
of short-horned grasshoppers in the family Acrididae.
These insects are usually solitary,
but under certain circumstances become more abundant
and change their behaviour and habits, becoming gregarious. 

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