Lesser Black-backed Gull

Larus fuscus – GWYLAN GEFNDDU LEIAF – Breeding summer visitor, passage migrant, winter visitor

Lesser Black-backed Gull – 2003-07 breeding

Larus fuscus – GWYLAN GEFNDDU LEIAF – Breeding summer visitor, passage migrant, winter visitor Comparison with previous atlas: 1984-88 2003-07 Breeding confirmed 24 30 Breeding probable 1 6 Breeding possible excluded from total excluded from total No of tetrads occupied 25 (of 478) 36 (of 490) Percentage of tetrads 5.2% 7.3% Formerly the main colonies […]

Lesser Black-backed Gull – 1994

Larus fuscus – GWYLAN GEFNDDU LEIAF – Breeding summer visitor, passage migrant, winter visitor 1984-88 Breeding confirmed 24 Breeding probable 1 Breeding possible excluded from total No of tetrads occupied 25 (of 478) Percentage of tetrads 5.2% Mathew (1894) knew of colonies of 20-30 pairs which Lockley et al (1949) used as a datum to note a […]

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. […]

Lesser Black-backed Gull – 1980s winter

Larus fuscus – GWYLAN GEFNDDU LEIAF – Breeding summer visitor, passage migrant, winter visitor The BTO winter atlas showed that Lesser Black-backed 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 46 […]