Calidris canutus – PIBYDD YR ABER – Winter visitor and passage migrant. Not recorded in June
The BTO winter atlas showed that Knots were present in some coastal and estuarine 10km squares during the winters of 1981-82, 1982-82 and 1983-84.
The colour, for each 10km square represents 1-32 birds.
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.