What is the difference between a grasshopper and a locust?
There are many species of Short Horned Grasshoppers. Usually they are solitary, avoiding each other except for reproduction, but occasionally, especially if they are in crowded conditions, they start to change. They start breeding rapidly, producing offspring that are different colors, with larger brains, sharper senses, and very different behavior, including becoming very gregarious as a swarm. In the locust form, they also become cannibalistic, eating each other if they can't find enough other food.