MADISON, Wis. (AP) – The Horicon Marsh Education and Visitor Center is set to host a presentation on North American bears this week.  Naturalist Randy Hetzel is scheduled to appear at the center on Wednesday evening. Hetzel has studied black bears in Wisconsin and grizzlies in Wyoming. He’ll give a presentation on three species of North American bears. He’ll address bear ecology, habits and management. He’ll also share photographs of trapping, handling and working with live bears. Wisconsin Department of Natural Resources officials say the presentation will be appropriate for all ages.