In Crown Prince Rudolph's day, the Corn Crake was a common meadowland bird in the Danube wetlands. Today, the endangered Corn Crake is one of the ornithological highlights of the Donau-Auen National Park. This rare bird is usually concealed in damp meadows with lush high grasses. And although it is rarely seen, its loud, far-carrying cry is heard at night. The dramatic decline in the Corn Crake population is due mainly to the destruction of damp meadows and intensified agricultural activity: early mowing and large, efficient machinery prevent successful reproduction. In recent years, the Corn Crake has become the European flagship species among endangered meadow birds and as such, has attracted widespread attention. Within the framework of the LIFE Nature Project, the re-colonization of the Corn Crake in the Donau-Auen National Park has been supported with carefully targeted measures.