(VA) (Audubon Society of Northern Virginia) Occoquan Bay NWR is one of the best places to see waterfowl in northern Virginia. Walk leader Greg Butcher is the recently retired Migratory Species Coordinator for U.S. Forest Service International Programs. He is a Ph.D. ornithologist who has worked for the National Audubon Society, American Birding Association, Partners in Flight, Birders World magazine, and Cornell Lab of Ornithology.