J. M. Hanson, W. C. Mackay, E. E. Prepas, Effect of Size-Selective Predation by Muskrats (Ondatra zebithicus) on a Population of Unionid Clams (Anodonta grandis simpsoniana), Journal of Animal Ecology, Vol. 58, No. 1 (Feb., 1989), pp. 15-28
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Hanson et al. (1989) studied this question.
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