What animal moves slowly and sees poorly, yet is one of the best-protected creatures on earth? Nature's walking pincushion-the porcupine! Each porcupine has about 30,000 sharp, barbed quills, which in one species grow 12 to 15 inches long and are as thick as soda straws. It appears soft and even 'petable.' But the animal that bothers this prickly rodent will be sorry!