Western Palaearctic

The Western Palaearctic or Western Palearctic is part of the

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 used as markers are less effective biogeographic separators.^[2] The climate differences across the Western Palearctic region can cause behavioral differences within the same species across geographical distance, such as in the sociality of behavior for bees of the species Lasioglossum malachurum.^[3]

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