Tachybaptus ruficollis
The Migration Atlas (2002) suggests that most Little Grebes disperse from their breeding area to winter elsewhere. It also states that there are still many unknowns about their migration, citing very few examples of immigration based on ring recoveries. BWP considered autumn and spring records on or near the British east coasts, especially at lighthouses, indicated immigration from the Continent.
There are no records of Little Grebes visibly migrating in Pembrokeshire, possibly meaning they pass at night but there have been none noted at local lighthouses. Diurnal records of birds on the sea at Strumble Head and Skomer and visiting ponds on Skokholm, Ramsey and most frequently Skomer, indicate dispersal at least and possibly longer distance migration as well.
Graham Rees
(Covers records up to and including 2008)
References
CRAMP. S. (Editor), 1977 – 1994. Handbook of the Birds of Europe, the Middle East and North Africa : the birds of the Western Palearctic, Oxford University Press, 9 Vols.