Locust/ˈləʊkəst/ Definition 1 of 2Pro Tip 1/3Destructive Swarms Locusts are notorious for destroying crops and causing famines. The locust swarm devastated the region's agriculture. Pro Tip 2/3Historical Plagues Locusts have been feared since ancient times, often mentioned in historical texts. Locusts were one of the plagues in ancient Egypt. Pro Tip 3/3Natural Disasters Locust invasions are considered natural disasters because of their impact. Aid was sent to help farmers after the locust disaster.