Second Nature: environmental enrichment for captive animals

This edited volume brought together early scientific work on environmental enrichment, consolidating it into a coherent field. Chapters covered the history, theory, design and evaluation of enrichment across taxa, including carnivores, and made the case that enrichment is a serious discipline grounded in behavioural biology rather than a hobby. The book argued enrichment should aim to increase behavioural diversity and the animal's ability to cope with and control its environment. It became a landmark reference that professionalised enrichment practice in zoos and shaped how institutions approach the welfare of captive felids and other species. Many subsequent enrichment frameworks trace their lineage to its conceptual contributions.