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P.M. Thompson, G.J. Pierce, J.R.G. Hislop, D. Miller, J.S.W. Diack, Winter Foraging by Common Seals (Phoca vitulina) in Relation to Food Availability in the Inner Moray Firth, N.E. Scotland, Journal of Animal Ecology, Vol. 60, No. 1 (Feb., 1991), pp. 283-294
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Thompson et al. (1991) studied this question.
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