C. J. Pennycuick, Mark R. Fuller, Jack J. Oar, Sean J. Kirkpatrick, Falcon versus Grouse: Flight Adaptations of a Predator and Its Prey, Journal of Avian Biology, Vol. 25, No. 1 (Mar., 1994), pp. 39-49
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Pennycuick et al. (1994) studied this question.
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