The plague of the desert: locusts!

Locusts invaded the Draa Valley of southern Morocco in the summer of 1988. Here, you see them swarming in the city of Ouarzazate. They are big, winged grasshoppers two to three inches long. Locusts move with the heating of the air in the morning; rise and ride on the thermals, and descend late in the afternoon when the heat dissipates. They are at the mercy of the wind, and are a cloud of winged insects. They land where the wind carries them; if they are lucky enough to land in some greenery like this in town or in the oasis, they can strip it in a few hours.