Celebrate Earth Day and Department of Conservation and Recreation Park Serve Day at the Alewife Reservation, under the auspices of the Cambridge Science Festival, based at MIT. On Saturday April 25, 10-2, participate in Massachusetts’ 3rd annual Park Serve Day with a spring clean-up of the reservation. Come spruce up and discover your local urban wild by cleaning the south trail, Blair Pond, and Yates Pond, as well as trails throughout the broader reservation. On Sunday, April 26, 10-12, experience “Walk on the Wild Side” with Tracker and Birder David Brown!! He will lead the group up the north trail to Little Pond on a one-mile trek to see the multiple eco-systems, birds, and perhaps evidence of gray fox and river otter. For both events, meet across the street from Alewife T passenger pick-up. Families are welcome; children under 10 must be accompanied by an adult. Long pants and shirts, sturdy walking shoes, and a water bottle are essential. Events hosted by Friends of Alewife Reservation. Contact FAR with questions at 617-415-1884.