Rissa tridactyla – GWYLAN GOESDDU – Breeding resident and passage migrant
The BTO winter atlas showed that Kittiwakes were present in six coastal and one estuarine 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 43 birds, numerical presence varying with the strength of onshore winds.
Graham Rees. Pembrokeshire County Bird Recorder 1981-2007
Data collected by volunteers for the BTO. Lack, P. 1986 Atlas of wintering birds in Britain and Ireland. T & A.D. Poyser.