Animal stories See all topics Facebook Tweet Email Link Link Copied! Follow Six months after he published “On the Origin of Species,” Charles Darwin wrote a letter to his friend, Asa Gray. He was troubled by a family of parasitic wasps, the ichneumonidae , that lays its eggs in the body of another insect, such as a caterpillar; when the young hatch, they devour the host. “I cannot persuade myself that a beneficent and omnipotent God would have designedly created the Ichneumonidae,” he wrote .

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