Second nature : environmental enrichment for captive animals / edited by David J. Shepherdson, Jill D. Mellen, and Michael Hutchins.
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An outcome of the First Conference on Environmental Enrichment held at the Metro Washington Park Zoo, Portland, Or., July 16-20, 1993. Includes bibliographical references and index.
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Second nature : environmental enrichment for captive animals / edited by David J. Shepherdson, Jill D. Mellen, and Michael Hutchins.