MONDAY

Bog walk, 9 a.m. in Jefferson

Hidden Valley Nature Center will host hikes with field naturalists this summer. The series will run mid-June through mid-August and is designed for amateur naturalists. It begins Monday with a lesson on bog ecology.

The nature center has a 200-foot boardwalk extending out into a kettle hole bog ecosystem, allowing great access to bog plants with minimal disturbance. Meet at the nature center gate on Egypt Road in Jefferson at 9 a.m.

The class will last two hours. The cost is a suggested donation of $15. To learn more, go to www.hvnc.org.

TUESDAY

Bird song ,7:15 p.m. in Wells

The York County Audubon Society’s annual meeting will feature bird songs by Monica Grabin. From cuckoos to owls to ravens, birds have long been the songs in cultures around the world. Grabin will share her music and stories of birds.

Meet at the Wells Reserve at Laudholm Farm on 342 Laudholm Farm Road in Wells.

WEDNESDAY

Knowing Maine frogs, 7:30 p.m. in Bangor

The Bangor Land Trust is exploring and studying the various frog choruses in their area. Every frog species makes its own unique and often surprising sound.

Come learn about the frog and toad species of Maine. Meet at the Walden Park kiosk. Be sure to wear appropriate footwear and insect protection. To get to the kiosk, turn right onto Walden Park Way off of Essex Street just past the Church Road intersection. Follow Walden Park Way for about one mile and then turn right onto Tamarack Trail.

To learn more, call 942-1010.

THURSDAY

Hike for toddlers, 10 a.m. in Boothbay

The Boothbay Region Land Trust hosts a walk at Lobster Cove Meadow Preserve for parents and caregivers with babies and toddlers.

The walk for young children takes place at a different preserve on the third Thursday of each month from April to October. Meet at the preserve trail head off Route 96.

For more information on the event, please write to thall@bbrlt.org or call 633-4818.

Send calendar events to dfleming@pressherald.com