In October 2000, the Department for the Environment, Transport and the Regions (DETR) commissioned a consortium (consisting of the BTO, the RSPB/Oxford University Farmland Bird Group, the Central Science Laboratory (CSL) and WildWings Bird Management) to undertake a study of the decline which has occurred in the populations of the Common Starling Sturnus vulgaris and House Sparrow Passer domesticus


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