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The black-faced dioch or red-billed weaver (Quelea quelea) is a seri-
ous pest to small-grain farmers in Africa. It has the distinction of
being the most numerous and perhaps the most destructive bird in the
world. It is known to adversely affect the agricultural economies of
between twenty and twenty-five nations by its depredations of cereal
crops such as millet, sorghum, wheat, and rice.