The adult true armyworms are nocturnal insects. Examples of local extinction have been documented in crickets, larval armyworms and flour beetles. Many African countries have agreed to take urgent actions against armyworms. A few sweet corn varieties have partial, but not complete, resistance to armyworms. Tanzania experienced a particularly horrible infection of armyworms in 2005. It is related to other vegetable pests, like the cutworm and armyworms. The town also suffered infestations of armyworms, grasshoppers and Mormon crickets, which harmed local agriculture. African armyworms primarily lay their eggs in clusters on the lower side of leaves. Marabou storks pick armyworms from the grass and quelea chicks from their nests.