You’ll want to bundle up for this birding trek to the now-closed landfill adjacent to the Blue Mash Nature Trail, a familiar birding spot in upper Montgomery County. As afternoon fades to dusk in the open terrain here, we’ll search for resident and overwintering species, including Northern Harriers and Short-eared Owls. The leader from the Audubon Naturalist Society will bring along a scope for distant bird viewing. Our visit to this area which is “closed to the public” is by special permission. Cost is $24 for ANS members; $32 for non members. Register online.