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by: COURTESY OF OREGON WILD, Visitors meander through Big Bottom, along the Clackamas River.

EVENTS

Northwest Solar Expo

Homeowners and business owners who want to learn more about clean energy options are invited to this expo presented by the Oregon Solar Energy Industries Association.

April 19-20, Oregon Convention Center, 777 N.E. Martin Luther King Jr. Blvd., 503-235-7575, www.nwsolarexpo.com, $12

National Wildlife Week

Celebrate the 70th anniversary of National Wildlife Week by taking part in the National Wildlife Federation's wildlife watch. Go to www.nwf.org/wildlifewatch for a brief list of plants and animals to look out for, and record your findings to become part of a national database.

April 19-27, www.nwf.org

Audubon Society Birdathon

Gather up your sponsors and enter the annual birdathon, which raises money for the Audubon Society of Portland. Participants attempt to view as many wild birds as possible in a given amount of time.

April 19-May 19, www.audubonportland.org

Beneath Big Trees: An Evening With Andy Kerr

Oregon Wild presents Andy Kerr, a founding member of the conservation group and a longtime activist for protecting old-growth forests in the Northwest.

6 p.m. to 7 p.m. Wednesday, April 23, Lucky Labrador Brew Pub, 915 S.E. Hawthorne Blvd., 503-236-3555, www.oregonwild.org

EXCURSIONS

Morning Song Bird Walks

Breathe in the fresh morning air and learn to identify the songs of resident and migrating birds. Guided walks take place on a rotating schedule at Tualatin Hills Nature Park, Mount Tabor, Camassia Reserve (West Linn) and Pittock Mansion. See www.audubonportland.org for details.

7 a.m. every Tuesday-Friday through June 6

Lunch With the Birds

Spotting scopes, binoculars and field guides are provided for learning how to identify waterfowl and other birds. Meet at the north viewing shelter next to the Clean Water Services treatment plant on Oregon Highway 219, south of Hillsboro.

Noon to 1 p.m. Wednesday, through April 30, Jackson Bottom Wetlands Preserve, 2600 S.W. Hillsboro Highway, Hillsboro, 503-681-6278, www.jacksonbottom.org

Walk at Tryon Creek

Join a weekly guided walk through Tryon Creek State Park, with a different theme each week. April 19, learn to identify native plants. Suitable for all ages; no registration required.

10 a.m. to 11:30 a.m. Saturdays, Tryon Creek State Park, 11321 S.W. Terwilliger Blvd., 503-636-4398, www.tryonfriends.org

Hike on the Wetlands

Guide Rick Balazs leads a slow-paced hike, seeking out the wildlife of the bottoms, with an emphasis on birds. Dress for weather and mud. Call ahead to register.

9 a.m. to noon, Saturday, April 19, Jackson Bottom Wetlands Preserve, 2600 S.W. Hillsboro Highway, Hillsboro, 503-681-6278, www.jacksonbottom.org, $3

Reptiles and Amphibians

Doug Robberson teaches about reptiles and amphibians of the Tualatin River National Wildlife Refuge. RSVP to programs Fanno Creek Greenway bike ride

Join Jim Labbe of the Audubon Society of Portland and Joe Blowers of Friends of Fanno Creek to explore the Fanno Creek Greenway by bike. Helmets are required. Register online at www.audubonportland.org to receive directions by e-mail, or call 503-292-6855, ext. 116.

9 a.m. to noon Saturday, April 19, www.audubonportland.org

Wild Foods of Oxbow

Wild Food Adventures teaches you how to find edible wild foods including fiddlehead fern, elderberries, Solomon's seal, fairy bells, nettles, red huckleberries and salmonberries. Registration required. Call for details.

1 p.m. to 5 p.m. Sunday, April 20, Oxbow Regional Park, Southeast Division Street, Gresham, 503-775-3828, www.wildfoodadventures.com, $22 per person plus $4 per vehicle park entry fee

Oaks Bottom Wildlife Refuge walk

In honor of Arbor Day, join naturalist Mike Houck for a 2-mile tour of Oaks Bottom, identifying trees along the way. The walk includes some rough terrain but is suitable for families. Call to register.

8 a.m. to 11 a.m. Friday, April 25, Southeast Seventh Avenue and Sellwood Boulevard, 971-222-6116, www.audubonportland.org

John James Audubon's Birthday Paddle

Naturalist Mike Houck leads a paddling trip around Ross, Hardtack, East and Toe islands and discusses the natural history of the four-island archipelago as well as issues of public ownership and long-term management of the islands. Equipment not provided. Suitable for beginning paddlers. Registration required.

8 a.m. to 11 a.m. Saturday, April 26, 971-222-6116, www.audubonportland.org

Wildflower hike at Tualatin Hills Nature Park

Find the densest areas for wildflowers in the park and learn to identify them. Call to register.

1:30 p.m. to 3:30 p.m. Saturday, April 26, Tualatin Hills Nature Park, 15655 S.W. Millikan Road, 503-629-6350, www.thprd.org/parks/thnp.cfm, $10

Paddle on Smith and Bybee

Watch for birds and beavers and learn about the natural history of the lakes. Bring your canoe or kayak, life vest, binoculars, drinking water and a snack. To reserve a space or for information, contact trip leader Troy Clark, 503-249-0482.

Noon to 4 p.m. Sunday, April 27, Smith and Bybee Wetlands Natural Area, 5300 N. Marine Drive, www.smithandbybeelakes.org

Wildflowers at Oxbow

Learn about wildflowers, first indoors and then out on the trail. Suitable for adults and teens. Register and pay in advance.

Noon to 3 p.m. Sunday, April 27, Oxbow Regional Park, Southeast Division Street, Gresham, 503-797-1850 option 4, www.metro-region.org (click on Places and Activities, then Places to Go), $10 per person plus $4 per vehicle park entry fee

KIDS

Preschool: Jump, Slither and Crawl

At this weekly event, parents and children ages 3 to 6 get to learn about the natural world through art, stories, hikes and more. Call to register.

1 p.m. to 2 p.m. Mondays, Tryon Creek State Park, 11321 S.W. Terwilliger Blvd., 503-636-4398, www.tryonfriends.org

Story and Stroll at Tryon Creek

Every Friday, join a park naturalist for nature story time and a stroll through the park. It's geared toward families with children ages 3 to 6, but all are welcome. To register, call 503-636-9886, ext. 225.

1 p.m. to 2 p.m. Fridays, Tryon Creek State Park, 11321 S.W. Terwilliger Blvd., 503-636-4398, www.tryonfriends.org

Kids' Night Out

Do flying squirrels really fly? Find out at this pizza party followed by nighttime forest exploration. For kids 7 to 12. Call to register.

6 p.m. to 9 p.m. Friday, April 18, Tryon Creek State Park, 11321 S.W. Terwilliger Blvd., 503-636-4398, www.tryonfriends.org, $25

TrackersPDX open house

Tracking wild animals is just the beginning. Learn about TrackersPDX's many programs for kids and adults, including hikes, martial arts, wilderness skills and sustainable food, plus summer camps.

10 a.m. to 4 p.m. Sunday, May 4, the Scout Pit, 5040 S.E. Milwaukie Ave., 503-453-3038, www.trackersnw.com

WORKSHOPS AND TALKS

Willamette River slide show

Join Willamette Riverkeeper for a photographic journey down the Willamette River, from headwaters to confluence. Learn about work being done to protect and improve this amazing river system, and find out how you can get involved. RSVP to This email address is being protected from spambots. You need JavaScript enabled to view it. .

7 p.m. Thursday, April 17, Portland Boathouse, 1515 S.E. Water Ave., 503-223-6418, www.willamette-riverkeeper.org

The Future of Food

The Oregon Food Bank presents a lecture by Ken Meter, a farm and food systems analyst. Learn about the food system in the Northwest and how it can become more sustainable. First come, first seated.

Doors at 6:45 p.m., lecture at 7:30 p.m., Thursday, April 24, First Congregational Church, 1126 S.W. Park Ave., www.oregonfoodbank.org

What Good Are Bugs?

Scott Black, an entomologist with the Xerces Society, explains the value of insects to our human way of life. Tickets are available online.

7 p.m. to 9 p.m. Tuesday, April 29, Oregon Zoo, 4001 S.W. Canyon Road, 503-226-1561, www.oregonzoo.org, $8-$10

Amphibians and Reptiles of the Portland Metro Area

Learn about frogs, turtles, salamanders and the notorious newt at this multimedia presentation by Doug Robberson of the Audubon Society of Portland. Call 971-222-6119 for required registration.

7 p.m. to 9 p.m. Wednesday, April 30, Heron Hall, Audubon House, 5151 N.W. Cornell Road, www.audubonportland.org, $20 public, $15 Audubon members

The Green Dividend for Companies and Cities

The Oregon Environmental Council presents a business forum on going green. Speakers are Pierre Trevet, the managing director of Innovest Strategic Value Advisors, and Joe Cortright, the vice president of Impresa Inc. Reserve a place at least 10 days in advance.

7:30 a.m. to 9:30 a.m. Thursday, May 8, Doubletree Hotel Lloyd Center, 1000 N.E. Multnomah St., 503-222-1963, ext. 100, www.oeconline.org, $35

WORK PARTIES

Tryon Creek State Park

Help remove invasive species, restore native plants and clean up trails.

9 a.m. to noon Saturdays, Tryon Creek State Park, 11321 S.W. Terwilliger Blvd., 503-636-4398, www.tryonfriends.org

Lone Fir Cemetery

In honor of Earth Day, help clean up the winter debris at this historic cemetery. Bring your own rake and gloves.

10 a.m. to noon, Saturday, April 19, Southeast 20th and Morrison streets, 503-775-6278, www .friendsoflonefircemetery.org

George Himes Park

Restore native plants and landscape during a restoration work party hosted by the Hillsdale Neighborhood Association and the West Willamette Restoration Project.

9 a.m. to noon Saturday, April 19, meet at the corner of Southwest Nebraska Street and Terwilliger Boulevard; for information, call Melanie, 503-699-9825

Tualatin Hills Nature Park

Help remove invasive plants including English ivy, Himalayan blackberry and English holly. Bring your own loppers, shovel, gloves and water.

9 a.m. to 1 p.m. Sunday, April 20, Tualatin Hills Nature Park, 15655 S.W. Millikan Blvd., Beaverton, 503-629-6305 ext. 2953, www.thprd.org/parks/thnp.cfm

Summercrest Park

Help remove invasive Hima-layan blackberry. Bring loppers, gloves and water. Meet at the park entrance.

9 a.m. to noon, Saturday, April 26, Southwest 170th Avenue and Rigert Road, Washington County, 503-629-6305, ext. 2953

Marquam Nature Park

Help Friends of Marquam Nature Park and the West Willamette Restoration Project restore the urban forest. Meet at Council Crest Park.

9 a.m. to noon, Saturday, April 26, Southwest Council Crest Drive, 503-699-9825

- Anne Marie DiStefano

Events are free unless noted. E-mail event listings to sustainable @portlandtribune.com.