Lehigh Gap Nature Center will have its 21st Migration Fest on Saturday, starting at 10 a.m.

The event is a celebration of the Appalachian Mountains ecology along the Kittatinny Ridge. All activities are at the center’s Osprey House visitor and education center.

A bird walk for beginners and families will kick off the day at 10 a.m.

A variety of events, exhibits, vendors and music will be held during the festival, which ends at 3 p.m. The event is free.

The Osprey House is at Lehigh Gap Nature Center off Paint Mill Road in Washington Township, Lehigh County, north of Slatington. For directions go to http://lgnc.org/how-to-get-here/ or call LGNC at 610-760-8889.