Brian D. Greene, James R. Dixon, James M. Mueller, Martin J. Whiting, Okla W. Thornton, Jr., Feeding Ecology of the Concho Water Snake, Nerodia harteri paucimaculata, Journal of Herpetology, Vol. 28, No. 2 (Jun., 1994), pp. 165-172
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Greene et al. (1994) studied this question.
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