WINCHESTER — Families flocked to the Winchester Public Library on a bright sunny summer day for an up-close adventure with camels, zebras, kangaroos, and more, courtesy of Avalon Farms’ popular petting zoo. Cody McCord, who runs the business with his fiancée Marissa, shared the story behind the operation during the event. What began as a simple desire for a few goats quickly grew into a full-fledged petting zoo and farm experience. “With Marissa…