Diet of adult and immature North Norwegian Black Guillemots Cepphus grylle
Barrett, R.T., Christensen-Dalsgaard, S., Anker-Nilssen, T., Langset, M., Fangel, K. 2016. Diet of adult and immature North Norwegian Black Guillemots Cepphus grylle. Seabird 29: 1-14.