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adult robins appeared August 1st autumn aviary bird behaviour Bird Ringing bird song bird's blackbird blue tit breeding season Brit British Birds British robins brood Burkitt chaffinch Chapter chased cock robin coition Colour-ringing coloured courtship courtship-feeding crested grebe Dartington dunnock eggs elicited Eliot Howard Enniskillen expectation of further experiments feeding fierce fighting found dead Gilbert White grey lag habit hatched hen robin Hence Howard human incubation individual robin inherited instinctive behaviour intruding robin juvenile robin latter leave the nest male robin mate mealworms migrate migratory newcomer non-migratory normally noted observed occasionally occurs owner pair of robins pair-formation parent robins perched records red breast feathers redstart robin attacking robin population robin territories robin's nest robins ringed sang sexual selection similar sing sometimes song-birds song-sparrow species spring stuffed robin stuffed specimen survival value territorial behaviour threat display trap trespass unmated cock usually wild robins winter young robins