Mark R. Fuller, William S. Seegar, Linda S. Schueck, Routes and Travel Rates of Migrating Peregrine Falcons Falco peregrinus and Swainson's Hawks Buteo swainsoni in the Western Hemisphere, Journal of Avian Biology, Vol. 29, No. 4, Optimal Migration (Dec., 1998), pp. 433-440
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Fuller et al. (1998) studied this question.
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