Chamove, A. S. 1989. Environmental enrichment: A review. Animal Technology 40(3), 155-178.

The aims of this contribution are to look at three areas which are addressed by enrichment studies, within the context of a review: (1) the problems produced by spatial restriction, (2) the goals of enrichment, and (3) the evaluation of enrichment techniques. I hope to put the first two of these into a conceptual framework to help guide future research. Includes a review of feeding enrichment and inanimate enrichment studies.