Ireland has fewer animal and plant species than either Britain or mainland Europe because it became an island shortly after the end of the last glacial period, about 10,000 years ago. Many different habitat types are found in Ireland, including farmland, open woodland, temperate broadleaf and mixed forests, conifer plantations, peat bogs, and various coastal habitats. According to the WWF, the territory of Ireland can be subdivided into two ecoregions: the Celtic broadleaf forests and North Atlantic moist mixed forests.