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While zoos preserve animal species for posterity, zoo operators have a problem keeping the creatures entertained and enriched. The phenomenon of listless, bored animals is a crucial problem in zoos, and the challenge is to keep them stimulated.
On every World Environment Day on June 5, the United Nations Environment Programme (UNEP) presents the Global 500 award to individuals and groups for outstanding achievement in conservation. Here are this year#8217;s laureates.