Cities are often home to a variety of habitats and animal and plant species. Nevertheless, numerous biotopes and species are lost through sealing and building development. Still, other species cannot cope with the insular character of urban green spaces, pollutants and the urban climate. At the same time settlements are taking up more and more space worldwide. But the protection of biodiversity must not be limited to rural areas. After all, urban nature offers space for recreation, fresh air axes, unsealed flood plains, cooling on hot days and the opportunity to experience animals and plants in our everyday lives. The planning of protected areas at the beginning of the 1990s included an "inventory" of the animal and plant species in the areas already protected or designated as protected areas the areas provided for. How has biodiversity developed since then? Are protection efforts successful? This book examines these questions. It presents the results of a new inventory in which the occurrences of weaver spiders, dragonflies, grasshoppers and grasshoppers, cicadas, bugs, beetles, moths, amphibians, reptiles, birds, bats, fungi, lichens, mosses and vascular plants in the Halle conservation areas were examined between 2015 and 2017.