Wolves WWF Wall Calendar: Wolves live in highly structured social units, where every individual has its place and purpose. You’re invited to observe the pack members as they go about their daily lives in this fascinating 2013 calendar. In the U.S. and Canada, World Wildlife Fund (WWF) receives 50 cents for each 2013 WWF calendar purchased, with a guaranteed contribution of $50,000. UPC: 9781620210437