Wolves' wisdom and the social structure of the packs make them fascinating to study. Photographing these elusive animals is an enormous challenge, but National Geographic photographers have contributed twelve remarkable images to this incredible 2013 calendar, including gray wolves in Montana and a European wolf in Saarland, Germany.

Not available for shipment outside of the U.S. and Canada.

• 12-month calendar: January-December
• 13" x 24" open.
• Mini-calendars of prior and following months, U.S. and International holidays, phases of the moon.