Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²Diet of minke whales Balaenoptera acutorostrata in Scottish (UK) waters with notes on strandings of this species in Scotland 1992-2002, G.J. Pierce, M.B. Santos, R.J. Reid, I.A.P. Patterson and H.M. Ross, J. Mar. Biol. Ass. U.K. (2004), 84, 1241-1244