Join us on Sunday, May 12, and Sunday, May 19, from 8:00 – 10:30 am for “Birding in Thoreau’s Footsteps with Peter Alden,” Concord’s native ornithologist, author, and naturalist, at Walden Pond State Reservation with frequent collaborator Lillian Stokes & others. Alden has authored 16 wildlife books, including National Audubon’s Field Guide to New England. He is also on staff at the Thoreau Society Shop at Walden.