Winter Bird Seed Sale.  Feed your feathered friends premium birdseed and benefit the Chattahoochee Nature Center.  Pre-sale orders can be placed online or at the Nature Store.  Chattahoochee Nature Center, 9135 Willeo Road, Roswell.  Pick up at Nature Center February 17-19.  More info:  770-992-2055 or www.chattnaturecenter.org.