Herring Gull

Larus argentatus – GWYLAN Y PENWAIG – Breeding resident and winter visitor

Herring Gull – 2003-07 breeding

Larus argentatus – GWYLAN Y PENWAIG – Breeding resident and winter visitor Comparison with previous atlas: 1984-88 2003-07 Breeding confirmed 63 69 Breeding probable 3 5 Breeding possible excluded from total excluded from total No of tetrads occupied 66 (of 478) 74 (of 490) Percentage of tetrads 13.8% 15.1% Only 40 years ago Herring Gulls […]

Herring Gull – 1994

Larus argentatus – GWYLAN Y PENWAIG – Breeding resident and winter visitor 1984-88 Breeding confirmed 63 Breeding probable 3 Breeding possible excluded from total No of tetrads occupied 66 (of 478) Percentage of tetrads 13.8% Mathew (1894) commented on an increase in the number of breeding herring gulls in the wake of the sea birds […]

Herring x Lesser Black-backed Gull hybrids

Harris, M.P. 1970. Abnormal migration and hybridization of Larus argentatus and L. fuscus after interspecies fostering experiments. Ibis 112: 488-498. Summary Between 1962 and 1966 eggs of Larus argentatus and L. fuscus were interchanged andalmost 900 young were reared by the wrong species. Many of these cross-fostered young were later recovered or retrapped on and away from the colonies. […]

Herring Gull – 1980s winter

Larus argentatus – GWYLAN Y PENWAIG – Breeding resident and winter visitor The BTO winter atlas showed that Herring Gulls were present in most 10km squares during the winters of 1981-82, 1982-82 and 1983-84. The darker the colour, the higher the relative total count for each 10km square.  The darkest blue represents over 400 birds. All squares […]

Herring Gull – 1949

Species account from the Birds of Pembrokeshire, 1949, by Lockley, Ingram and Salmon.

Herring Gull – 1894

Species account from the 1894 ‘Birds of Pembrokeshire and its Islands’ by Rev M A Mathew