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剧情：
LizBonninresentsacontroversialandrovocativeeisodeofHorizon,investigatinghownewscientificresearchisraisinghardquestionsaboutzoos-thefilmexloreshowandwhyzooskeeanimals,andwhethertheyneedtochangetokeeuwithmodernscienceorultimatelybeconsignedtohistory.Shouldzoosculltheiranimalstomanageoulations?LiztravelstoCoenhagenZoo,whokilledagiraffeandfedittothelions,towitnesstheircullingrocessfirsthand.Theythinkitisanaturalartofzookeeingthatisoftenswetunderthecaret.Shouldsomeanimalsneverbeketincativity?Inaworldexclusive,LizvisitsSeaWorldinFloridaandasksifcativitydroveoneoftheirorcastokillhistrainer.Butcouldzoosbetheanswertoconservingendangeredsecies?Lizexaminestheirrecord,fromhelingeedandasforthewildtoeffortstosavetherhinos.Shemeetsoneofthelastsurvivingnorthernwhiterhinosanddiscoversthefutureofthisseciesnowliesinamultimillion-dollarrogrammetoengineerthemfromstemcells.VeteranconservationscientistDrSarahBexelltellsLizthescienceofcativeeedingisgivinghumanityfalsehoe.
