Autumn Exploration Camp, 9 a.m. to noon today, Merryspring Nature Center, Camden. Nature discovery activities for children ages 6 to 12. $25 for members; $30 for non-members. Register by Wednesday. FMI: Call 236-2239 or visit www.merryspring.org

Mushroom walk, 10 a.m. Saturday, at Macdonald Woods on Kents Hill Road in North Wayne. Bring a basket with paper bags, a knife for collecting and field guides. Rain or shine. Please pre-register by calling 377-2848, or emailing [email protected]

Compass and Navigation Course, 8 a.m. to 4 p.m. today, Hidden Valley Nature Center in Jefferson. The class will be held rain or shine and is limited to eight participants (minimum 4). The cost is $75, $65 for HVNC members. Register before Wednesday by calling Gary at 586-6752 or emailing [email protected] FMI: www.hvnc.org.

York County Audubon field trip, 7 a.m. to 9:30 a.m. today, to the Sanford Sewage Treatment Plant, 192 Gavel Road, Sanford. Meet Andrew Aldrich at the plant office and look for migrating waterfowl, warblers and others. FMI: Call 698-4461.

Farm to Farm Ultra Run, today, starts at Wolfe’s Neck Farm, Freeport. Race 50 miles, 50 kilometers or 25 kilometers to raise awareness of conservation and local foods. FMI: Call 865-4469, ext. 107, or visit www.farmtofarmultrarun.com.

Lunch ‘n’ Learn: Birding in York County, noon Monday, Mather Auditorium, Wells Reserve at Laudholm, $2 suggested donation. Marie Jordan of the York County Audubon Society will cover bird identification techniques, bird songs, feeder recommendations and where to go birding. A bird walk along the trails follows the presentation. Bring your lunch. FMI: 646-1555 or wellsreserve.org.

Sportsmen’s Forum, 5 to 8 p.m. Monday, with Chandler Woodcock, commissioner of the Department of Inland Fisheries and Wildlife, hosted by the Southern Maine Fish and Game Club, Martin Road, Kittery. The public is invited to the free event, including a ham-and-bean potluck supper. FMI: www.southernmainefishandgame.angelfire.com.

Birding on Monhegan Island, 7 p.m. Tuesday; join York County Audubon to hear Doug Hitchcox’s presentation. Refreshments at 6:30 p.m. Mather Auditorium, Wells Reserve at Laudholm Farm, 342 Laudholm Farm Road, Wells. FMI: Call 251-1135 or go to www.yorkcountyaudubon.org

Saco River Salmon Club monthly meeting, 7:30 p.m. Wednesday, Trinity Episcopal Church, 15 Cleveland St., Saco. Christine Feurt, Ph.D., will speak on “Surprises on the Saco — UNE Research Discovering Rich Biodiversity in the Saco Estuary.” Dinner will be served starting at 6 p.m. RSVP to [email protected]; $8 suggested donation.

Wildflowers and Edible Wild Foods with Wanda Garland, 6:30 p.m. Thursday, Camden Public Library, 55 Main St. Co-hosted by Mid-Coast Audubon. Free. FMI: Call 236-3440.

Halloween at Maine Wildlife Park in Gray, Friday and Saturday 6-9 p.m. Adults and kids are invited to wear their costumes and enjoy haunted hay rides, games, contests and more. Regular park admission applies: ages 3 and under free; ages 4-12 $5; adults $7 and seniors $5. FMI: Call 657-4977 or visit www.mainewildlifepark.com.

Looking Ahead

Dick Weeman Memorial Scholarship Gun Bash, 2 p.m. to 5 p.m. Oct. 23, Elks Club, Waterville. Sponsored by the Maine chapter, National Wild Turkey Federation. Raffles, games and silent auction to raise funds for scholarships for students pursuing outdoors professions. FMI: Call Chris Weeks at 465- 2112 or 692-3300. 

Navigating Mid-Coast Maine, 6 to 8 p.m. Oct. 24, 26, 31 and Nov. 2, class offered by the Coast Guard Auxiliary Flotilla at the Wiscasset EMA Center. The Three Rivers chart (#13293) and a copy of a chapter on navigation principles are included. A parallel ruler and dividers are needed and can be purchased separately. For more information or to register, contact David Eastwood at 633-4748 or email [email protected]

Owl Prowl, 7 p.m. Oct. 26, Wells Reserve at Laudholm. See how researchers band owls, then awaken your senses by walking the trails after dark, calling for owls and discovering your own night adaptations. For ages 8 and up. $7/$5. Reservations required. Call 646-1555 or go to wellsreserve.org.

Ongoing

Mid-Coast Audubon Birdseed Sale, orders must be received by Thursday, email [email protected] or call 380-1370. Pickup is from 9 a.m. to noon Oct. 29 at Plants Unlimited, Route 1, Rockport. FMI: Visit www.midcoastaudubon.org.

The South Portland Land Trust has released its first trail map and guide. The map is available for $4.95 at Nonesuch Books and South Portland City Hall. The trust is also providing copies to South Portland libraries and schools. FMI: www.southportlandlandtrust.org.

Nature programs, 2 p.m. today, Monday, Saturday, Oct. 16, 22, 23, 29 and 30, Wolfe’s Neck Woods State Park, Freeport. Free with park admission of $1 for ages 5 to 11, $3 for Maine residents 12 to 64, $4.50 for non-residents, $1.50 for non-residents over 65, free for kids under 5 and Maine residents 65 or over; meet at the benches by the second parking lot, weather permitting. FMI: 865-4465.

Little Lake Stewards Story Time, 10 a.m. to noon Oct. 21, Nov. 18, Dec. 16, Jan. 20, Feb. 17, March 16 and April 14, at the Portland Water District’s Sebago Lake Ecology Center, 1 White Rock Road, Standish. Environmentally themed stories, activities and crafts for preschoolers. Please pre-register by calling 774-5961, ext. 3319 or 3320 or emailing [email protected] $10 donation for entire series or $2 per session.

Guided trail walks at Inland Woods/Pine Ridge trails in Waterville. 8 a.m. Mondays through October. Free. Meet at trailhead behind Inland Hospital, 200 Kennedy Memorial Drive. FMI: www.kmtrails.org or 861-3292. 

Weekly Bird Walk, 7 a.m. Thursdays at Gilsland Farm, off Route 1, Falmouth; $5 for Maine Audubon members, $8 for nonmembers. Bring binoculars and a field guide and meet in the visitor center parking lot. FMI: Call 781-2330, ext. 209.

Casco Bay Bicycle Club hosts several weekly road bike rides and special one-time rides. Members and nonmembers are welcome. FMI: www.cascobaybicycleclub.org.