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"This book deserves to be bought and read by a wide audience. It should be required reading for all undergraduate students intending to carry out research projects involving environmental enrichment."
Animal Welfare
"Scientific and passionate in the promotion of environmental enrichment."
Lab Animal News (US)
"Professor Young effortlessly leads the reader through the important scientific concepts and recognises the human dimension to what happens in practice. He writes with the passion of someone dedicated to improving animals in captivity."
"In short, if you want to learn more about environmental enrichment I do not know of a better place to turn, whatever your background."
Veterinary Times , 2004