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If animals can learn to discriminate between safe and harmful plants, then why do they eat poisonous plants and die? Under most circumstances animals can learn if a plant is safe or harmful because eating any plant results in feedback from the gut to the brain. Feedback usually tells the body whether or not a food contains high levels of toxins. Unfortunately, in some situations this mechanism for discriminating safe from harmful foods is circumvented causing animals to suffer from over ingestion of poisonous plants.