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Porcupines mate in late summer and early fall. Porcupines are very vocal during mating season. Males often fight over females. The male performs an elaborate dance and sprays urine over the head of the female. Seven months after mating the female gives birth to a single baby. When the baby is born, its quills are soft. They harden about an hour after birth. The baby is begins to forage for food after only a couple of days. The baby will stay with its mother for about six months.