Hybrid Herring X Lesser Black-backed Gulls.--During 1968, on Skokholm, Pembrokeshire, about ten young were reared by mixed pairs of Herring Gulls Larus argentatus and Lesser Black-backed Gulls L. fuscus. These young, which resembled juvenile Lesser Black-backed Gulls, were marked with British Trust for Ornithology rings and various combinations of yellow, orange and red rings. Owing to the difficulties of proving such inter-specific matings, either by observing copulation or by seeing individuals of both species incubating the same clutch of eggs, there seem to be virtually no published records of this mixed pairing in Britain. Any observations of these colour-ringed hybrids or information on previous records of mixed pairs of Herring and Lesser Black-backed Gulls, published or unpublished, would be welcomed by Dr. M. P. Harris, Edward Grey Institute, Botanic Garden, Oxford.
Issue 9
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