Gary R. Hepp, Robert J. Blohm, Ronald E. Reynolds, James E. Hines, James D. Nichols, Physiological Condition of Autumn-Banded Mallards and Its Relationship to Hunting Vulnerability, The Journal of Wildlife Management, Vol. 50, No. 2 (Apr., 1986), pp. 177-183
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Hepp et al. (1986) studied this question.
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