2013-09-092009-09-152013-09-092009-04-152008-09-152009-08-12Osuagwuh, JC 2008, A multi-species study on feed-based environmental enrichment at the National Zoological Gardens, Pretoria, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-08122009-104437/ >E1365/gmhttp://hdl.handle.net/2263/31164Dissertation (MSc)--University of Pretoria, 2008.Please read the abstract on page 14 of this dissertation. Copyrighten© 2008, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria.UCTDMulti-speciesPretoriaZoo animalsAnimal behaviorFeedingsEnvironmental enrichmentSouth AfricaDissertationhttp://upetd.up.ac.za/thesis/available/etd-08122009-104437/