David Werschkul, Ellen McMahon, Mary Leitschuh, Scott English, Charlotte Skibinsk, George Williamson, Observations on the Reproductive Ecology of the Great Blue Heron (Ardea herodias) in Western Oregon, The Murrelet, Vol. 58, No. 1 (Spring, 1977), pp. 7-12
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Werschkul et al. (1977) studied this question.
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