TYNGSBORO -- Learning about nature, along with a town cleanup, highlight the fourth annual, two-day Earth Day 2009 Celebration this weekend.

On Saturday from 9 a.m. to 1 p.m., Earth Day organizers invite volunteers to show their community spirit and town pride by doing some spring cleaning at the Sherburne Nature Center, 48 Coburn Road, or any of the town's four schools. Cleanup participants are urged to bring any of the following tools: rakes, flat shovels, brooms, gloves, wheel barrows clippers, trash bags, leaf bags or barrels, and drinking water.

On Sunday, Earth Day observances continue at the Sherburne Nature Center from 1 to 4 p.m.

Dozens of fun, family-oriented conservation activities are planned, from wildlife puppet shows to nature walks and educational exhibits. Inside the Nature Center, Mark Fraser, host of the popular Nature Walks with Mark TV series will present a 30-minute locally filmed wildlife documentary.