Historical area of the European beaver (Castor fiber L.) firstly covered whole Croatian territory. The beaver has dissapeared during the 19th century in most European countries, including Croatia. Comparing to the other countries successful projects of taking beavers back to their natural habitats, Croatia has also made the significant project "The beaver in Croatia", which has been successfully accomplished. Plans for this project first begun in 1992. while the first beaver was brought to Croatia in 1996. Therefore, beavers from Bavaria were transported to the two areas: to the place of Legrad - branches of Drava and to the place of Žutica. Excellent preservation of natural watercourses in Croatia provides a constant population growth. The European beaver is the biggest rodent in the northern hemisphere. It is a semiaquatic species, famous for his teeth which it uses for gnawing trees and building its dwellings and dams. Main reasons for their extinction are the excessive hunting and excessive fragmentation of their habitats. Beavers population is important for their biodiversity, the aquatic environment, tourism and education. The existence of the beavers and the way of their life have a negative impact on agricultural crops, surrounding trees, fruits, coastlines etc. Based on the Regulation of hunting, the beaver is protected animal and the year-round hunting is strictly prohibited by law. The most important is to educate the whole population about the way of life these unique spieces, arrange various presentations and seminars, as well as prevent destroying the nature in order to provide the European beaver to live more liberately.