With such an effective defense system the porcupine has no need for the safety of a herd and can thus live a very solitary life. Primarily nocturnal, porcupines spend most nights eating twigs, roots, stems and vegetation in the summer months or pine needles and tree bark in the winter. Far from graceful, porcupines frequently fall out of trees. Being fairly heavy and tempted by vegetation on small branches, it is not uncommon for a porcupine to take a tumble. Luckily, the porcupine has antibiotics in its own skin to prevent infection if it’s stuck with one of its quills.