Rolf Brittas, Tomas Willebrand, Nesting Habitats and Egg Predation in Swedish Black Grouse, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 22, No. 3, Proceedings of the 5th International Symposium on Grouse, 20-24 August 1990, Elverum, Norway (Jul. - Sep., 1991), pp. 261-263
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Brittas et al. (1991) studied this question.
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