Monotremes, like the platypus, lay eggs and don't have placentas. So how does the mother's body know when to start lactating?
Male lactation: Fact of fiction? That’s the question on today’s Moment of Science. In 1979, a scientist concluded that there is no insurmountable physiological reason that men can’t lactate, or produce breast milk. In fact, there are a couple of cases where elderly men who received estrogen to treat prostate cancer were actually induced to [...]