STRONG CITY, Kan. (AP) — The annual Flint Hills butterfly census is coming up, and officials at the Tallgrass Prairie National Preserve are inviting the public to take part. The daylong count is scheduled to begin at 8:30am Saturday, starting at the preserve's stone barn on Kansas 177 just north of Strong City. Officials say no experience with identifying butterflies is necessary. Volunteers are asked to bring binoculars, water, sunscreen and bug spray. Last-minute walk-ins will be welcomed as volunteers are divided into groups for a full or half-day of counting. The Tallgrass Prairie National Preserve is located in eastern Kansas' Chase County. It's a partnership of The Nature Conservancy and the National Park Service.