James R. Herkert, Scott A. Simpson, Ronald L. Westemeier, Terry L. Esker, Jeff W. Walk, Response of Northern Harriers and Short-Eared Owls to Grassland Management in Illinois, The Journal of Wildlife Management, Vol. 63, No. 2 (Apr., 1999), pp. 517-523
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Herkert et al. (1999) studied this question.
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