They associate with the large wintering flocks of Black-headed Gulls and can be seen feeding on scraps in the car parking areas scattered along the promenade, roosting in grassy areas within the industrial complex directly inland of the promenade and on the groynes and breakwaters at the harbour entrance and river mouth. It is not unusual to see up to 15 birds roosting on the saltmarsh from the first hide along the north sea wall during April and May, with birds being recorded between early March and mid June and from late July to early October. One to two birds are also regularly present at Ness Point, Lowestoft, in the winter, commuting between the harbour and the outfall offshore of the Point. Up to four birds are regularly present in Langstone Harbour between October and March, with further passage birds recorded in April-May and August. They can be found roosting in the large Black-headed Gull flock on the northern shore of Farlington Marsh Lagoon or on nearby playing fields.
Evenings are best.
Leave the A27 westwards at the A2030 junction and turn immediately left on the roundabout into the Farlington Marshes car park. Drive eastwards parallel to the A27 and park. Elsewhere in Hampshire, Mediterranean Gulls can be seen at a number of locations, primarily in winter. These include Titchfield Haven NR, Pennington and Keyhaven Marshes, Southsea Canoe Lake, Weston Shore, Needs Ore Point, the IBM Lake at Cosham and Alresford Pond. Chew Valley Lake - Avon Numbers of Mediterranean Gulls visiting Chew Valley Lake have fluctuated from nine to 21 birds in the last twelve years, with most being recorded between December and March.