Ellis S. Bacon, Gordon M. Burghardt, Ingestive Behaviors of the American Black Bear, Bears: Their Biology and Management, Vol. 3, A Selection of Papers from the Third International Conference on Bear Research and Management, Binghamton, New York, USA, and Moscow, U.S.S.R., June 1974. IUCN Publications New Series no. 40 (1976), pp. 13-25
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Bacon et al. (1976) studied this question.
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