State Senator Pat Jehlen (D-Somerville) and volunteers from her office recently lent a hand in planting trees and building houses for birds and bats during the Department of Conservation and Recreation’s Park Serve Day. The crew helped build two houses for bats, whose appetite for mosquitoes help control the population, near Bellevue Pond in Medford and other locations in the Fells. Pictured above are Corin Parsons, Director of Legislative Affairs and Community Outreach for Sen. Jehlen, Analise Hartnett, Bob Fitzpatrick, Chief of Staff and General Counsel for Sen. Jehlen, and Sen. Jehlen. Photo courtesy Corin Parsons.