The black-faced (or Sudan) dioch is the red-billed quelea (Quelea quelea)
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The Blackfaced Dioch is a typical bird of the semi-arid (Sahelo- Sudanese) zone.
The grassy stratum is made up principally of a number of species of Gramineae whose seeds constitute the staple food of the adult Black-faced Diochs all the year around.
The Anti-Locust Research Centre now regards the menace of the black-faced dioch as a crop pest over two million square miles of Africa as serious enough for it to transfer resources from insect control to studying the 'feathered locust' as this species is called.