With the exception of a pre-1650 colony in Portsmouth Harbour, Hampshire, Black-headed Gulls Larus ridibundus first bred in the area of Hampshire and adjacent coastal counties at Rempstone Heath, Poole Harbour, Dorset, in 1884, in Newtown Harbour, Isle of Wight, in 1884 (possibly earlier) and at East Parley Common, Hurn, Dorset, in 1891. Today, only the Newtown Harbour colony still survives, while


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