Bird nesting grounds
The disappearance of the tide had significant consequences for the bird life in the Grevelingen area. The number of birds visiting the coastal belt, such as the oystercatcher, the bar-tailed godwit and the grey plover, dropped sharply, while the number of fish and plant-eating birds increased strongly. Fish-eating birds, such as the red-breasted merganser, the great-crested grebe and the black-necked grebe hunt by sight in clear and food-rich Lake Grevelingen. Large numbers of these birds spend the winter here. In addition to a wide diversity of water birds, the Grevelingen also is home to many types of songbirds. They profit from the dense vegetation that is found in some island locations, and such as in the North Slikken van Flakkee area.
Some birds, such as the skylark, the black-tailed godwit and the black-necked grebe, are found on the Red List of threatened birds. The pasture areas are perfectly suited as a nesting area for pasture birds, such as the lapwing, the redshank and the black-tailed godwit. Ringed plovers and avocets nest on the muddy edges of the lake and on the various shell islands created specifically for them. Part of the South Slikken van Flakkee area is mowed short for the benefit of thousands of geese that spent the winter here.
Each year, various shorebirds nest on the various islands in the Grevelingen. The avocet, the ringed plover, the Kentish plover and even the red-breasted merganser can be found in varying nesting grounds. The Dutch Forestry Commission in conjunction with a bird watcher catalogues and counts the birds. To ensure a quiet area for the birds, the natural island of Hompelvoet is not accessible from 15 April - 15 August, and the Kleine Stampersplaat, Kleine Veermansplaat and Markenje areas are closed to the public the entire year.