David Jenkins, R. J. Harper, Ecology of Otters in Northern Scotland: II. Analyses of Otter (Lutra lutra.) and Mink (Mustela vision) Faeces from Deeside, N.E. Scotland in 1977-78, Journal of Animal Ecology, Vol. 49, No. 3 (Oct., 1980), pp. 737-754
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Jenkins et al. (1980) studied this question.