On 5th May 2020, a Common Swift Apus apus returned to a nestbox on my house in Langton Matravers, Dorset, where Swaifts have nested for several years. That year, however, the box was already occupied by Common Starlings Sturnus vulgaris and held three well-grown young. Around midday on 5th May, there was a sudden commotion as a Swift and an adult Starling, grappling togeth

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