What is the difference between a grasshopper and a locust?


First, the term "locust", like many common names, can be confusing, as there are other, very different insects that also have that name. That is why scientists usually use long taxonomic names instead.

There are several species of short horned grasshoppers that are usually solitary, which under the right conditions, change their behavior (and often their color). The change causes them to seek other locusts, and move as a swarm. It also stimulates other grasshoppers to make the change to the locust phase.