The red-billed quelea (Quelea quelea Linnaeus) is the most important avian pest of smallgrain crops in semi-arid zones in Africa. It feeds principally on native grasses but when these are scarce the birds will attack the seed heads of crops like millet, sorghum, wheat, and rice. The average quelea bird eats around 10 grams of grain per day, so a flock of two million can devour as much as 20 tons of grain in a single day.