Literature
- Hammond P.S. and Prime J.H. 1990. The Diet of British Grey Seals (Halichoerus grypus). In: Bowen W.D. (ed.) Population biology of Sealworm (Pseudoterranova decipiens) in relation to its intermediate and seal hosts. Can. Bull. Fish. Aquat. Sci. 222: 243-254.
- Hammond P.S., Hall A.J. and Prime J.H. 1994. The diet of grey seals around Orkney and other island and mainland sites in north-eastern Scotland. J. Appl. Ecol. 31: 340-350.