|ring area||The Netherlands (spread across the country) and German Wadden Sea|
|observations||192587, of which 10360 are captures|
|ringed in||1983 to 2021|
Every year, several hundred Oystercatchers are individually colour-marked in the Netherlands and Schleswig-Holstein. Both adult breeders and nearly fledged chicks are marked.
Observations of these marked animals allow us:
This knowledge is very important to identify the causes of the dramatic population decline of this longlived species (current record 46 years) in the Netherlands : due to an annual decrease of 5%, the population has more than halved since 1990.