Calling all local birders! Ornithologist Dr. Andy Mack will present a birding talk on “Spring Migration” at the Bellbrook headquarters of the St. Xavier Nature Preserve. This evening lecture will be followed by a Saturday morning bird walk through the fields and forests of St. Xavier.  This is the first of four “Birds Across the Seasons” paired events presented by Dr. Mack.  All events are open to the public and free to attend.