Learn about the fascinating lives of bluebirds, their behavior, why their populations declined, and restoration efforts. Instructor Sylvia Marek, Arboretum naturalist, created the Arboretum bluebird trail in 1988 and has monitored it for more than 30 years. Instructor: Sylvia Marek, Arboretum naturalist. Indoor presentation followed by a walk of the trail. Fee: $20, register by May 27. Meet at the Visitor Center.