Of or pert. to the arctic regions collectively

designating a realm or region including the northern parts of the Old and the New World. It comprises the Palearctic and Nearctic regions or subregions.

Biogeographic region that includes the Old World (Palaearctic, Eurasia) and the New World (Nearctic, North America).

a faunal region comprising the whole of Europe, Northern Africa as far as the Sahara, Asia, down to the Himalaya Mountains and North America down to Mexico

Zoogeographic region comprising the Nearctic (North America and Greenland) and the Palaearctic

The Northern Hemisphere zoogeographic regions, combining Eurasia and North America to the temperate regions.

Biogeographical region including the northern parts of the New and the Old World; the Nearctic and the Palearctic regions combined.

Occurring in the temperate regions of the entire Northern Hemisphere.

with a geographical distribution encompassing the Palaearctic and Nearctic Regions.

a distribution that more or less circles the Arctic, so occurring in both the Nearctic and Palearctic biogeographic regions. Found in northern North America and northern Europe or Asia.

The Holarctic is a term used by zoologists to define the ecozone covering much of Eurasia and North America, which have often been connected by the Bering land bridge. The two regions 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. More commonly, this is defined as two separate areas, the Palearctic (Eurasia) and Nearctic (North America).