SATURDAY

Lovely Lichens, 10 a.m. to noon in Bath

The Kennebec Estuary Land Trust celebrates lichens at its fourth summer exploration this week at the Thorne Head Preserve in Bath. Learn to identify common lichen species and how they benefit the forest with Maine master naturalists Becky Kolak and Fred Cichocki. Lichens are an organism made up of fungi and algae. The harmonious relationship between the two allows lichens to grow in a vast array of environments from arctic tundra to rain forests to the mixed woodland of the land trust’s own Thorne Head Preserve. The event will take place rain or shine. Registration is recommended. Call 442-8400 or write to bkolak@kennebecestuary.org.

WEDNESDAY

Preschool Exploration, 11 a.m. in Scarborough

The new preschool nature exploration program at Ferry Beach State Park offers a fun and interactive environment for kids ages 5 and under, and their caregivers. Activities include nature stories, outdoor crafts and a guided walks. The preschool nature exploration takes place Wednesdays at Ferry Beach State Park through September. To learn more, call 865-4465.

UPCOMING

Tree Farm Celebration, Sept. 6 in Jefferson

Hidden Valley Nature Center is celebrating both its Maine state and Northeast regional Outstanding Tree Farm of the Year Award with an all-day party featuring music, local food, beer and speakers from many walks of conservation. Live logging demonstrations will take place, as well as ecological tours of the nature center’s best trails. No cost. All welcome. Hidden Valley Nature Center is on Egypt Road in Jefferson. To learn more, go to www.hvnc.org.

Avian Ecology, 9 a.m. Sept. 16 in Jefferson

Hidden Valley Nature Center and the Biological Research Institute are offering a demonstration on mist-netting, a common method for capturing birds. Learn about local bird ecology with a special emphasis on annual migrations, diseases and other threats to bird populations. Patrick Keenan, BRI’s outreach director, will share experiences of his involvement in research and talk about the work the institute is doing in Maine. The class runs from 9 to 11 a.m. Suggested donation is $12. Register at www.hvnc.org/registration. A rain date is set for Thursday, Sept. 18.

Send calendar items to Deirdre Fleming at dfleming@pressherald.com