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Literature
• Birds of North America, online• Cade, T. J. 1982. The falcons of the world. Cornell U.
Press.• Hailman, J. P. 1969. How an instinct is learned. Scientific
American.• Johnsgard, P. A. 1990. Hawks, eagles, & falcons of
North America. Smithsonian Press, Washington.• Nelson, B. 1979. Seabirds, their biology and ecology.
A&W. New York• Newton, I. 1979. Population ecology of raptors. T&AD
Poyser. London