Colombia Avian Treasures, Menunkatuck Audubon Society meeting and talk with Gina Nichol of Sunrise Birding, 7:30 p.m. April 11, James Blackstone Library, 758 Main St., Branford, 203-457-1699, email@example.com, www.menunkatuck.org.
Build It and They Will Come, New Haven Bird Club talk and meeting with Twan Leenders, 7 p.m. April 12, Jones Auditorium, Connecticut Agricultural Experiment Station, 123 Huntington St., New Haven, 203-230-1697, www.newhavenbirdclub.org.
Net Zero Energy Challenge House Tour, People's Action for Clean Energy tour of the winning house and energy-related seminars, 11 a.m. and 2 p.m. April 14, Voluntown, $20, www.pace-cleanenergy.org, 860-623-5487.
Milford Earth Day, volunteer opportunities, planting native shrubs and wildflowers, invasive species removal, general clean-up, 8 a.m.-3 p.m. April 14, Eisenhower Park, North Street, Milford, www.milfordearthday.org or firstname.lastname@example.org.
Practical Beekeeping, Center for Sustainable Living program with Alphonse Avitabile, zoologist, retired UConn bee researcher and author of "The Beekeeper's Handbook," 2 p.m. April 14, 90 Cabbage Lane, Bethlehem, $45, preregistration required, www.connsoil.com.
East Rock Birding and Trail Maintenance, with Ranger Dan Barvir, 8 a.m.-noon April 14, meet at Eli Whitney Museum parking lot, 915 Whitney Ave., Hamden, 203-946-6086.
Osprey and Eagle Cruises, aboard the RiverQuest, 9:30 a.m. April 14 and 4 p.m. April 21, Eagle Landing State Park, Route 82, Haddam, $35, passengers must be at least 10 years old, reservations at www.ctriverquest.com.
Spring Bird Walks, Audubon Shop's 26th annual, 7:50 a.m. Saturdays, April 14-June 16, Hammonasset Beach State Park, meet at shop, 907 Boston Post Road, Madison, $4, 203-245-9056, www.theaudubonshop.com. Looking for migratory shorebirds, songbirds, birds of prey.
Richard English Memorial Field Trip, 8:30 a.m. April 15, meet at Lighthouse Point Park hawk watch parking lot. Trip continues to Richard English Bird Sanctuary on Deer Lake in Killingworth and finishes at Hammonasset Beach State Park in Madison. NHBC President Mike Horn leads the trip, 203-288-1891, email@example.com. Bring lunch for all-day trip.
The Wonderful World of Lichens, Naugatuck Valley Audubon Society meeting, 7:30 p.m. April 17, Kellogg Environmental Center, 500 Hawthorne Ave., Derby, $4-$2, 203-888-0358. Learn to identify different kinds of lichens and see pixie cups, disks and coral-like structures through a stereomicroscope.
Wildflower Hike, Wallingford Public Library Environmental Literacy Initiative program, with conservation commissioner Dianne Saunders and park ranger Mark Cervoni, 4 p.m. April 21, Tyler Mill Preserve, meet at bridge on Tyler Mill Road, Wallingford, 203-265-6754. Rain date April 28.
Dudley Barrow Preserve, Guilford Land Conservation Trust walk with the Guilford High School Environmental Club and Molly Bell, 11 a.m. April 21, meet in Dudley Farm parking lot on Route 77, Guilford, 203-457-9748, www.guilfordlandtrust.org.
East River Woodlands, Guilford Land Conservation Trust walk with Gary Kaisen and Scott Tucker, 2 p.m. April 21, meet at East Gate Road, Guilford, 203-457-0674, www.guilfordlandtrust.org. Tucker will be filming for his "Expedition New England" show.
Ansonia Nature Center, New Haven Bird Club field trip with Maria Stockmal, 8 a.m. April 21, exploring pond, wetlands, thickets, grassy fields and woods, meet at nature center parking lot, 10 Deerfield Road, Ansonia, 203-488-3876, firstname.lastname@example.org.
Touch Tank, Ranger Russ Miller of Hammonasset, 1 p.m. April 21, Westbrook Public Library, 61 Goodspeed Drive.
Pulling Party, invasive plant removal with master gardener Walter Brockett, 10 a.m. April 21, Peter's Rock, meet at park entrance, behind First Fuel, 133 Middletown Ave., North Haven, 203-239-0149. Wear appropriate clothes and bring gloves and lopping shears if you have them.
Riverbound Farm Sanctuary, Quinnipiac Valley Audubon bird walk, 8:30 a.m. April 21 and 28, 1881 Cheshire St., Cheshire, 860-995-0656.
Landfill, Quinnipiac Valley Audubon bird walk, 7:30 a.m. April 22, Evansville Avenue, South Meriden, Ľ mile past Meriden Airport entrance, 860-995-0656.
The Secrets of Field Notes: Capturing Science, Nature and Exploration, John H. Ostrom Program Series, lecture and book signing with Harvard lecturer Michael Canfield, 5:30 p.m. April 26, Yale's Peabody Museum, 170 Whitney Ave, New Haven, 203-432-5050, www.peabody.yale.edu.
Bird Walk for Kids at East Rock Park, with Florence McBride, 9 a.m. April 28, meet at Eli Whitney Museum parking lot, 915 Whitney Ave., Hamden, 203-288-6777, email@example.com.
Red Bridge, Quinnipiac Valley Audubon bird walk, 7:30 a.m. April 29, Quinnipiac River Watershed Association on Hanover Pond, Oregon Road, Meriden, 860-995-0656.
Broomstick Ledges, Guilford Land Conservation Trust walk with Bill Bloss and Sarah Williams, 1 p.m. April 29, meet at Bluff Head parking lot, Route 77, Guilford, 203-457-9676, www.guilfordlandtrust.org.
Birdscaping, Conservation Committee of the Garden Club of New Haven program with Judy Richardson of Connecticut Audubon, 11:45 a.m. April 30, Connecticut Agricultural Experiment Station, 123 Huntington St., New Haven, learn how to make your yard more attractive to birds and butterflies, beverages and dessert provided, bring your own lunch. Plants, birdseed, feeders and birdhouses will be on sale.
Bears, Fishers & Coyotes, Potapaug Audubon Society meeting and talk with wildlife biologist Paul Rego of the CT DEEP, 7 p.m. May 3, Killingworth Public Library, 301 Route 81, Killingworth, 860-910-4342.
Island Keeper internships, U.S. Fish and Wildlife Service, working in the Stewart B. McKinney National Wildlife Refuge, May 21-August, live on islands performing wildlife and vegetation surveys, invasive species management and more, $180 per week. Send cover letter, resume, three references to Shaun_Roche@fws.gov, www.fws.gov/northeast/mckinney/
Marsh Botanic Gardens, docents wanted to expand hours. Greenhouses are open to the public 9 a.m.-5 p.m. Mondays-Fridays, 227 Mansfield St., New Haven, 203-432-6320, firstname.lastname@example.org, exhibits of carnivorous plants, desert specimens and sun-loving plants from around the world.
History of New Haven Bird Club, John Triana continues his work on the club archive. Anyone with photos, clippings or memorabilia to share can contact him at 203-758-7203 or email@example.com.
Send items for the Nature Calendar to Rick Sandella, features editor, New Haven Register, 40 Sargent Drive, New Haven 06511 or firstname.lastname@example.org. Call 203-789-5676.