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Edmund D. Brodie, III, Edmund D. Brodie, Jr, Evolutionary Response of Predators to Dangerous Prey: Reduction of Toxicity of Newts and Resistance of Garter Snakes in Island Populations, Evolution, Vol. 45, No. 1 (Feb., 1991), pp. 221-224
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Brodie et al. (1991) studied this question.
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