The Connah's Quay Nature Reserve on the Welsh side of the Dee Estuary is operated by E-on and the Deeside Naturalists Society and is the principal viewing point for RSPB Oakenholt Marsh. The history and current status of each of the 223 bird species recorded during the past 40 years is described in detail. A table showing the likelihood of finding each species on a single visit to the Reserve is shown for each month of the year.