Male rats don’t experience the hormonal changes that trigger maternal behaviour in female rats. They never normally participate in infant care. Yet put a baby rat in a cage with a male adult and after a few days he will be caring for the baby almost as if he were its mother. He’ll pick it up, nestle it close to him as a nursing female would, keep the baby rat clean and comforted and even build a comfy nest for it.29 The parenting circuits are there in the male brain, even in a species in which paternal care doesn’t normally exist.30 If a male rat, without even the aid of a William Sears
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