'Flies' in the Bible

"At that time, the LORD will call for flies that will come from far away from the headwaters of Egypt's rivers and for bees that are in the land of Assyria.

These [armies, like flies and bees] will all come and settle on the steep and rugged ravines and in the clefts of the rocks, and on all the thorn bushes and in all the watering places.

At the fords of the Arnon the Moabite women are like a bird that flies about when forced from its nest.