THIS TRIP IS FULL.  WAITLIST ONLY. Half-day trip starting at the Blue Mash Nature Trail, where we will look for a variety of songbirds and other species. Then we will drive over to the adjacent Oaks Landfill to look for raptors, Blue Grosbeaks, and possible Dickcissels and Grasshopper Sparrows. Limit:10. Meet at 7 a.m. at 20500 Zion Road, Laytonsville, Md. LEADER: Mark England at [email protected] or 240-308-4114.