A free, guided walk at Lake Sammamish State Park on Wednesday, Sept. 19, will help visitors discover dozens of different kinds of birds in the diverse ecosystem found at the south end of the lake.

A typical walk in the park in September encounters around 50 different bird species, from various grebes on the lake to Spotted Sandpipers at creekside, from Red-breasted Sapsuckers and Orange-crowned Warblers in the woods to Savannah Sparrows in the meadows.

Eastside Audubon guides Sharon Aagaard and Stan Wood lead a walk each month at the park, always midweek during the quiet morning hours when birding is best. The September 19 walk is from 8 a.m. to noon.

The tour involves walking two to three miles, and mud-proof shoes are advisable. Weather-appropriate layers, binoculars, and drinking water also are recommended.

Reservations are not required. The tour will meet just before 8 a.m. Come into the park at the main entrance, take the first left into the large parking lot and continue to the northeast end. A Discover Pass is required to park. (The Discover Pass is available online at discoverpass.wa.gov and from some sporting goods stores.)

Eastside Audubon is the National Audubon Society chapter active in Issaquah as well as in Bellevue, Bothell, Carnation, Duvall, Kirkland, North Bend, Redmond, Sammamish, Snoqualmie, Woodinville, and unincorporated East King County.

More information is available at www.eastsideaudubon.org.