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Evolution and history of the western Palaearctic avifauna

Trends in Ecology & Evolution, 1998
Recent data accumulated from fields as varied as avian palaeontology, palaeobotany, historical biogeography and molecular phylogenetics provide a completely renewed picture of the origin, evolution and distribution of modern birds. Although the origin of birds is still controversial, their Tertiary history is now well known.
J, Blondel, C, Mourer-Chauviré
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Passerine Migration between the Palaearctic and Africa

1989
Migration is one of the possible responses by which an organism can react to changes in its environment. The persistence of biological populations depends on their ability to find those conditions in space and time under which they can survive and reproduce most successfully. For example, seasonally favorable conditions are offered by vast areas of the
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Classification of Palaearctic grasslands