Wetlands are one of the most productive ecosystems on Earth. They are of great importance for biodiversity and perform other important functions such as flood protection and food source. In the Republic of Croatia, the Kopački rit Nature Park is one of the most important wetland habitats. Kopački rit is also on the list of the Ramsar Convention - signed in the Ramsar, whose mission is to protect and preserve wetlands. It is located in the northeastern part of the Republic of Croatia in the lowest part of Baranja. The relief forms of Baranja have been created by recent tectonic processes and climate changes since the end of the Pleistocene until today. Kopački rit has a moderately warm continental climate (Cfwa). In the area of the park, 400 taxa of vascular flora have been listed, of which 88 species are protected. Research on invertebrates began in 1943, and to date beetles, mollusks, earthworms, leeches, crabs, and insects have been studied. Invertebrates are an important food source for fish and other vertebrate groups. Kopački rit is inhabited by protected and strictly protected vertebrate species and is especially important as a habitat for amphibians and birds. This is evidenced by the fact that the ornithofauna of Kopački rit includes of 79.2% of Croatian bird species.