On several dates between 7th May and 1st June 1995, in my garden in Wilmslow, Cheshire, I observed interesting behaviour by House Sparrows Passer domesticus.Typically, a sparrow would follow about 5 cm behind a group of Common Starlings Sturnus vulgaris as the latter probed for invertebrates on the lawn. When a starling extracted a food item, the sparrow would `make a grab for it'; this was a syste


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