The Audubon Naturalist Society's April lecture features Robert Leberman and Robert Mulvihill, speaking on "Thirty-five Years of Learning from Birds", at Baird Auditorium, Museum of Natural History, Smithsonian Institution, 10th and Constitution, NW, Wash. D.C. The lecture begins at 6 p.m on Monday, April 13. For tickets, call 202-357-3030. The talk is about a pilot birdbanding study, using mist nets, that Robert Leberman began in 1961 at the Carnegie Museum's newly established Powdermill Nature Reserve, located in the Appalachian Mountains east of Pittsburgh. Joining Leberman in 1983 was Robert Mulvihill. From their data, Leberman and Mulvihill have discovered trends in hummingbird migration and Ovenbird survival, a dietary basis for plumage colors in Cedar Waxwings, and molt characteristics in several other passerines. Thanks to Kathy Klimkiewicz for pointing out that the first posting did not have a date.