Free, guided morning bird walks will be offered to the public during the weekend of Sept. 29 to Oct.1, as part of the American Birding Expo.

Volunteer guides will be on hand from 7:30 to 10 a.m. at six Philadelphia-area birding hotspots:

— John Heinz National Wildlife Refuge at Tinicum, 8601 Lindbergh Blvd., Philadelphia. This refuge provides a variety of habitats for birds in the urbanized setting of Philadelphia. Freshwater tidal marsh, open waters, mudflats and woodlands attract birds, including shorebirds and waterfowl in fall.

— John James Audubon Center at Mill Grove, 1201 Pawlings Road, Audubon, Pennsylvania. Mill Grove is the first American home of Audubon, and it remains a site to look for birds — mostly warblers and other migratory songbirds in fall. The grounds feature meadows, woodlands and some water, with about five miles of trails.

— Valley Forge National Historical Park, 1400 N. Outer Line Drive, King of Prussia, Pennsylvania. This site encompasses more than 3,000 acres of land, featuring forests, wetlands and meadows. More than 227 bird species have been recorded here. In fall, visitors can look for warblers, kinglets, vireos and other migrating passerines. Recommended birding areas are on Mount Joy, along Valley Creek and the Schuylkill River and in the meadows throughout the park.

— Militia Hill Hawk Watch at Fort Washington State Park, 500 Bethlehem Pike, Fort Washington, Pennsylvania. Sharp-shinned hawks, Cooper’s hawks, broad-winged hawks, northern harriers and bald eagles migrate to this site. Visitors are encouraged to join the hawk watch, and a compiler will be present to help identify birds and answer questions. Early morning and late afternoon are the recommended times of day to see migrating raptors here.

— Andorra Meadow in Wissahickon Valley Park, Valley Green Road, Philadelphia. Start at the Wissahickon Environmental Center and take one of the trails to the meadow. Watch for woodpeckers, chickadees, nuthatches, robins, catbirds, waxwings, goldfinches and migrating warblers. The Great Beech is located here.

Volunteer birding guides from local bird clubs will be on hand at each of the six sites. These walks are free and open to the public and will be filled on a first-come, first-served basis.

The American Birding Expo will take Sept. 29 to Oct. 1 at the Greater Philadelphia Expo Center, 100 Station Ave., Oaks, Pennsylvania.

For more, visit americanbirdingexpo.com.