IN 1944, as part of a study of the breeding biology of Swallows (Hirundo r. rustica) nesting in the barracks occupied by British prisoners of war at Eichstätt, Bavaria, a record was kept of all nests. Birds were ringed with rings supplied by Dr. E. Stresemann so that, by catching the adult birds at roost, it was possible to determine where second broods were raised by the same pair as the first...

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