European pond turtle
In the past, Tivoli Pond was a living place of numerous native fish, like the Danube roach ("Rutilus pigus"), the tench ("Tinca tinca"), the European bitterling ("Rhodeus amarus"), the zander ("Sander lucioperca"), the European perch ("Perca fluviatilis"), to the European crayfish ("Astacus astacus"), to amphibians such as the European tree frog ("Hyla arborea"), to birds such as the black-crowned night heron ("Nycticorax nycticorax"), the common moorhen ("Gallinula chloropus"), and the little bittern ("Ixobrychus minutus"). The ecosystem was severely hurt by several renovations and the introduction of non-native fish species by fishing clubs as well as by individual visitors. In addition, the red-eared slider ("Trachemys scripta elegans") and other pet turtles have been introduced, ousting the native European pond turtle ("Emys orbicularis").