USA HISTORY

Detailed explanation-1: -Locust swarms devastate crops and cause major agricultural damage, which can lead to famine and starvation. Locusts occur in many parts of the world, but today locusts are most destructive in subsistence farming regions of Africa.

Detailed explanation-2: -Sudden rainfall, for example, could help feed a growing population and cause flooding that corrals locusts together and attract more locusts to join. What starts as a small group can turn into a thrumming swarm of thousands, millions or even billions of locusts.

Detailed explanation-3: -Swarming behaviour is a response to overcrowding. Increased tactile stimulation of the hind legs causes an increase in levels of serotonin. This causes the locust to change colour, eat much more, and breed much more easily.

Detailed explanation-4: -The Locust Plague of 1874, or the Grasshopper Plague of 1874, occurred when hordes of Rocky Mountain locusts invaded the Great Plains in the United States and Canada. The locust hordes covered about 2, 000, 000 square miles (5, 200, 000 km2) and caused millions of dollars’ worth of damage.