In the lovely setting of the Stonehurst mansion, hear bird and nature book author Peter Alden tell his lively tale of a young male scarlet tanager. Through beatiftul illustrations, we follow the striking bird from his hatching in Concord's Walden Woods to his over-wintering in Peru and back to Concord to seek a mate. The lecture begins at 7 pm.

Alden, a well-traveled ecotourism guide, also co-organized the world's first Biodiversity Day with Edward O. Wilson. His talk is in memory of his friend, Dorothy Storer Long (1920-2012), granddaughter of Robert Treat Paine.

Co-hosted by the Friends of Stonehurst and the Waltham Land Trust. Visit www.stonehurstwaltham.org, www.walthamlantrust.org, peteraldenwildlife.com or call 781-314-3291.