Black magic ...

Black Guillemot (Cepphus grille)

The Black Guillemot (C. grille) is a very rare vagrant to the coastal waters of Sussex with only fifteen individuals recorded as of 2010. The British population, which is of the subspecies C. g. articus, is the second largest in Europe only to Norway and contains approximately 38,000 individuals (Seabird 2000) out of a European population 100,000-200,000 breeding pairs. Its UK distribution is very biased towards the far north and west, half of the population breeding in the Northern Isles, particularly Shetland; the nearest breeding populations to Sussex are small populations in southeast Ireland and Anglesey.

They typically nest in crevices or cavities between boulders, and occasionally in holes in harbour walls. Diving to feed, their diet is comprised of small bethnic fish and crustaceans.

References:

Hobson, J., 2014. Black Guillemot. The Birds of Sussex. Thetford: British Trust for Ornithology (BTO) Books on behalf of the Sussex Ornithological Society, pp. 346.

Fairbank, R., 1996. Black Guillemot. Birds of Sussex. Sussex Ornithological Society, pp. 347-348.

BirdLife International (2014) Species factsheet: Cepphus grylle. Downloaded from www.birdlife.org on 31st May 2014.