Although not the best portrait of a swimming auk, last month's mystery photograph (plate 33, repeated here) does show clearly the distinctive bill and head shape which alone enable it to be identified as a Brünnich's Guillemot Uria lomvia. There is ample excuse for those unable to recognise it: rare outside its Arctic breeding range, only one of the eight British examples during 1960-79 was seen al

...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now