Islands in Central Europe provide important refuges for ground-breeding wading birds, which make them susceptible to newly emerging predators like the domestic cat. On the island of Borkum, Germany, it is believed that feral cats could be an important factor which accounts for the reduction of population numbers of some meadow bird species. In the framework of the LIFE+-Nature-Project “Wiesenvögel” of the state of Lower Saxony, one goal is the improvement of the predator management on the island to effectively protect and develop the core areas of the meadow birds sanctuaries. Therefore, in order to gather basic information needed for predator management planning, the aim of this study was to gain data on the feral cats density and habitat use using camera traps. In a study period of 11 weeks from July to October 2012, 132 points were sampled. This was accomplished by weekly relocating 12 paired camera trap stations. The density estimation was carried out with the software CAPTURE and SPACECAP. Furthermore, occupancy and detection probability were modeled out of presence/absence data with the software PRESENCE. In comparison with densities of other areas, the dimension of the density estimation for Borkum in the range of 0.6-1.1 individuals/km (SPACECAP) seems to be feasible. Population density seems to be determined through food resources and hunting pressure. The analysis of habitat use indicates trends that dry, shelter providing habitats (dunes, salt marshes) are used more than wet, less structured meadow areas. Because of the results on density and habitat use it can be stated that at least during the study period feral cats probably constituted a moderate threat to ground-breeding wading birds on the island of Borkum. As feral cats are non-indigenous on the island and grassland birds are committed widely defenseless to ground-acting predators, feral cats should be the prospective focus of a predator management in order to minimize their potential impact.