Bluebird Nature Walk. [GS] Bluebirds, Nest Boxes and how they help. Join us for a walk of the garden and fields as we visit the volunteer-installed nest boxes and learn why they are important to the Eastern Bluebird. We will also identify the birds and butterflies seen along the way. Meet at the Carriage House. Rain cancels. FREE. Presented by the Bergen County Audubon Society.