what are locusts
In solitary phase (low numbers and densities), locusts behave as individuals, much like grasshoppers. In gregarious phase, they form dense and highly mobile (marching) bands of hoppers and flying swarms of adults (winged locusts), which behave as an entity.
The desert locust is potentially the most dangerous of the locust pests because of the ability of swarms to fly rapidly across great distances. It has two to five generations per year.