“Walk into Fall” will be offered with naturalist John Lynch at Jack London State Historic Park on Saturday, Oct. 5, from 10 a.m. to 1 p.m.

On this slow 1.2-mile (round trip) autumn ramble over to the London Grave site and on to the Wolf House, hikers will explore the changing season, count the various different kinds of oaks, look for “oak apples” and “flying saucer” galls and talk about the importance of oaks as a keystone species in the Valley of the Moon.

Lynch will alert walkers to listen for the "waka waka” of the acorn woodpeckers and watch for their black and white plumage and bright red crowns as they busily harvest this year’s abundant acorns. With Halloween right around the corner, the hike will include a search for “witches broom,” identifying various kinds of spider webs and a rehabilitation of the reputation of local bats.

This hike is appropriate for all ages.

Hikers will meet outside the House of Happy Walls Museum (Visitor Center) at Jack London State Historic Park, 2400 London Ranch Road in Glen Ellen.

Admission is $15 a person (which includes parking) and can be arranged in advance online at jacklondonpark.com.This hike will be limited to 12 participants.