Swarms of the desert locust, which invaded India via Pakistan in April, have made their way to at least five states, leaving a trail of destruction in their wake. Desert locusts move in large groups, called swarms, and can eat crops up to their own weight every day. When millions of locusts descend on a crop, they destroy everything. It is considered the most destructive migratory pest in the world and a single swarm covering one square kilometre can contain up to 80 million locusts. As per eyewitnesses, the swarm which entered India from Pakistan was about two to three kilometres long. Watch the video for more.