What country is the world's leading producer of olives?

Native to northern Argentina, Uruguay, Paraguay, and southern Brazil, the Argentine ant (Linepithema humile, formerly Iridomyrmex humilis) has been inadvertently introduced by humans to many other areas of the world, such as South Africa, New Zealand, Japan, Easter Island, Australia, Hawaii, Europe, and many parts of United States, including the southeastern U.S. and California. In its introduced range, the Argentine ant often displaces most or all native ants. This can, in turn, imperil other species in the ecosystem, such as native plants that depend on native ants for seed dispersal, or lizards that depend on native ants for food. Argentine ants also cause problems in agricultural areas by protecting plant pests, such as aphids and scale insects, from predators and parasitoids. In return for this protection, the ants receive a sweet excretion, known as "honeydew". Thus, when Argentine ants invade an agricultural area, the population densities of these plant parasites increase, and so too does the damage they cause to crops. Finally, Argentine ants are a common household pest, often entering structures in search of food or water (particularly during dry or hot weather), or to escape flooded nests during periods of heavy rainfall. Argentine ant colonies almost invariably have many reproductive queens, as many as eight for every 1,000 workers, so eliminating a single queen does not stop the colony's ability to breed. When they invade a kitchen, it is not uncommon to see two or three queens foraging along with the workers.