Editing Palearctic realm (section)

===Euro-Siberian region===

The boreal and temperate Euro-Siberian region is the Palearctic's largest [[biogeography|biogeographic]] region, which transitions from [[tundra]] in the northern reaches of [[Russia]] and [[Scandinavia]] to the vast [[taiga]], the boreal coniferous forests which run across the continent. South of the taiga is a belt of [[temperate broadleaf and mixed forests]] and [[temperate coniferous forest]]s. This vast Euro-Siberian region is characterized by many shared plant and animal species, and has many affinities with the temperate and boreal regions of the [[Nearctic realm]] of [[North America]]. Eurasia and North America were often connected by the [[Bering land bridge]], and have very similar [[mammal]] and bird fauna, with many Eurasian species having moved into North America, and fewer North American species having moved into Eurasia. Many zoologists consider the Palearctic and Nearctic to be a single [[Holarctic realm]]. The Palearctic and Nearctic also share many plant species, which botanists call the [[Arcto-Tertiary Geoflora]].