Hundreds of millions of desert locusts are swarming in Ethiopia, Kenya, and Somalia—some of the biggest numbers seen in more than 25 years. Unusually wet weather in the area toward the end of 2019 has contributed to the massive outbreak, driving an explosion of locusts that are destroying crops and threatening food security across the region. The United Nations Food and Agriculture Organization is requesting international assistance to combat the swarms, and warning of the potential for massive growth if they are left unchecked.