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Are there poisons that affect only mammals but not reptiles or crustaceans? E.g. hemotoxins which affect hemoglobin but not hemocyanin or specific Na+ channels? Looking for a "nice" poison/disease as idea for a fictional story to explain survival of reptiles/crustaceans vs. mammals.

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  • $\begingroup$ "Reptiles" are not very different from mammals (compared to crustaceans). $\endgroup$ – WYSIWYG Jun 26 '19 at 9:24
  • $\begingroup$ Good candidates would likely be poisons originating from reptiles/crustaceans themselves... $\endgroup$ – Jeppe Nielsen Jun 27 '19 at 2:32

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