Kruckenberg, Helmut. “Large-Scale Egg-Dumping by Island Nesting Greylag Geese Anser Anser: An Indication of Density-Dependent Regulation in a Breeding Population in Northwest Lower Saxony, Germany?”. Wildfowl (November 27, 2019): 221–229. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/154462.