EDP: English Moat Medieval Swannery or Modern Duck Pond?

Archaeologists are trying to puzzle out the purpose of Paul Meale's duck pond. Was it a medieval swannery or a 19th century wildlife sanctuary?

Meale is restoring the moat on his farm near Stalham, England, and hopes to discover its original use. Researchers have ruled out defense or a Roman lookout but feel it might be a medieval swannery, used for breeding the large birds.