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The Palearctic or Palaearctic is a biogeographic realm of the Earth, the largest of eight. Confined almost entirely to the Eastern Hemisphere , it stretches across all of Eurasia north of the foothills of the Himalayas , and North Africa .
The Palaearctic region has been recognised as a natural zoogeographic region since Sclater proposed it in 1858. The oceans to the north and west, and the Sahara to the south are obvious natural boundaries with other realms, but the eastern boundary is more arbitrary, since it merges into another part of the same realm, and the mountain ranges ...
A biogeographic realm is the broadest biogeographic division of Earth's land surface, based on distributional patterns of terrestrial organisms. They are subdivided into bioregions, which are further subdivided into ecoregions.
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The greatest diversity is in the Palaearctic region [1] and many of the familiar European species of bush crickets (e.g. in the genera Metrioptera, Pholidoptera, Platycleis and the type genus Tettigonia) are in this subfamily.
Rock partridge; Red-legged partridge; Barbary partridge; Houbara bustard; Red-necked nightjar; Western swamphen; Mediterranean gull; Yellow-legged gull (be); Audouin's gull (be); European storm-petrel (be)
A Manual of Palaearctic Birds. Vol. 1– 2. London: self-published. Volume 1, Volume 2; Dresser, Henry Eeles (1910). Eggs of the Birds of Europe, Including All the Species Inhabiting the Western Palaearctic Region. Vol. 1– 2. London: self-published. volume 1 (text), volume 2 (plates and their keys) (issued in 24 parts beginning in 1905)