The Owl Pages about owls - photos, calls, books, art, mythology and more.
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Olson, Storrs L. (1985): The fossil record of birds. In: Farner, D.S.; King, J.R. & Parkes, Kenneth C. (eds.): Avian Biology8: 79-238. Academic Press, New York.
Sánchez Marco, Antonio (2004): Avian zoogeographical patterns during the Quaternary in the Mediterranean region and paleoclimatic interpretation. Ardeola51(1): 91-132. PDF fulltext