Join Ph.D. ecologist Jim Erckmann for a free forest nature walk in Bridle Trails State Park from 10 a.m. to 1 p.m. Saturday, July 21.

Learn about the natural history, plants, and animals of this exceptional forested natural area, how biological diversity in forests develops over time, and how we are dealing with the threat of invasive plants to urban forests. Meet in the parking lot at Ben Franklin Elementary School.

Please sign up in advance at www.bridletrails.org.

Bridle Trails State Park is located at 12434 N.E. 60th St., Kirkland.