A successful hunter of Slovak streams, kingfisher (Alcedo atthis). Photo: P. Áč

Bustard (Otis tarda) is dropping in numbers in the Danube Lowland. Photo: P. Áč

The hoopoe (Upupa epops). The research carried out at the Institute of Forest Ecology covers all components of both forest and the adjacent ecosystems. Photo: T. Krištín

Nutcracker helps the expansion of cembra pine and hazelnut. Photo: Z. Vlach

Wild geese over the Danube Lowland. Photo: P. Áč

Nesting little bittern (Danube inland delta). Photo: P. Áč