Join Audubon Mid-Atlantic and the Delaware Valley Ornithological Club (DVOC) as we tour the reservoir for summer nesting season. Binoculars available for loan. The Delaware Valley Ornithological Club (DVOC) is one of the oldest ornithology organizations in the United States. Founded in 1890, the club has held regular meetings at the Academy of Natural Sciences of Philadelphia for over 125 years, and has published the periodical Cassinia since 1901. Membership is open to any dues paying person with an interest in birds. The club organizes birding field trips throughout the Delaware River valley region, including a dedicated year-round trip schedule within the city limits of Philadelphia (BirdPhilly). For more information, please visit: dvoc.org