organisms put a lot of work into discouraging the consumption of their body parts. Structural barriers are one method—cactus spines, porcupine quills, turtle shells. Another is poison, but it is often too crude to be maximally effective. If a deer dies after eating foxglove, the deer will be replaced by another deer that knows nothing of the plant’s poison. On the other hand, if a deer expands its dietary repertoire to include Psilocybe mushrooms, and spends the rest of the day having a temporary psychotic break, it may well look elsewhere for its next meal, having been educated, and perhaps
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