The large marsh grasshopper (Stethophyma grossum) is a Caelifera from the family of grasshoppers (Acrididae). The large marsh grasshopper is up to 4cm long and is also easily recognizable by its strikingly loud song (which sounds like the ticking of an electric pasture fence). It also lives in wet grassland and its fallows and puts the egg clusters into slightly disturbed soil, for example caused by cattle trampling. In contrast to the previous species, temporary flooding is necessary for the embryo of the large marsh grasshopper. Since the large marsh grasshopper can fly, it has better opportunities to colonize new habitats in the immediate environment. Our research will show whether the species still has a chance of survival despite the ongoing land use changes thanks to their ability to fly or due to increased winter flooding.