Phytogeographically, Poland belongs to the Central European province of the Circumboreal Region within the Boreal Kingdom. According to the World Wide Fund for Nature, the territory of Poland can be subdivided into three ecoregions: the Baltic mixed forests, Central European mixed forests and Carpathian montane conifer forests.
A wisent in the Białowieża Forest.
Many animals that have since died out in other parts of Europe still survive in Poland, such as the wisent in the ancient woodland of the Białowieża Forest and in Podlachia. Other such species include the brown bear in Białowieża, in the Tatras, and in the Beskids, the gray wolf and the Eurasian Lynx in various forests, the moose in northern Poland, and the beaver in Masuria, Pomerania, and Podlachia.
In the forests, one also encounters game animals, such as Red Deer, Roe Deer and Wild Boars. In eastern Poland there are a number of ancient woodlands, like Białowieża, that have never been cleared by people. There are also large forested areas in the mountains, Masuria, Pomerania, Lubusz Land and Lower Silesia.
Poland is the most important breeding ground for European migratory birds. Out of all of the migratory birds who come to Europe for the summer, one quarter breed in Poland, particularly in the lake districts and the wetlands along the Biebrza, the Narew, and the Warta, which are part of nature reserves or national parks.