Uria aalge albionis
Mathew says it nested on all islands and various mainland cliffs, especially the Stack Rocks, which are today a “tourist” attraction in south Pembs – charabancs run regularly from Tenby during July, and park within a stonethrow of these striking pinnacles of detached rock, and the Guillemots and Kittiwakes seem little disturbed by human sightseers. Breeds from Cemmaes Head to Caldey on suitable cliffs and stacks. Decreased during the war. Approximately 0.5% of the Guillemots on Skokholm and Skomer were estimated in 1946 to be of the “bridled” form.