The little tern is a small tern that lives on a gravel and sandbars of the European and Asian rivers. It is widespread, but very fragmented and endangered in many places.
A shy inhabitant of the dense old forests, the black stork is much rarer bird than its cousin the white stork.
The white-tailed eagle (Haliaeetus albicilla) is one the largest bird of prey found along the ricers in Europe. It is the ruler of the sky of the floodplains.
Gravel and sand bars are the layers of the sediment in the riverbed. It is not only the barren sediment; this is precious habitat for specialized animals and plants.