简介："CalloftheKillerWhale,"atwo-hourdocumentaryairingonPBS,beginsbyfocusingonthestoryoftheworld'smostfamouskillerwhale,Keiko,thestarofthefilm"FreeWilly,"whowasfamouslysetfreeafterbeingrescuedfromaMexicancircus.Keiko'sstoryisusefultoillustratethechallengesofreintroducinganorcaintothewild,havingtoteachithowtofeedofflivefish(asopposedtodeadonestossedregularlyintoitsmouth)andhowtodevelopothersurvivalskillsbasictowildorcas.Themessagewetakeawayfromthefirstpartofthefilmisthatcaptivewhalesrarelyliveverylongandhaveatoughtimeofitifthey'rereintroducedintothewild.Keikomadeitto27,beforesuccumbinginaNorwegianfjord. Thesecondandmorepowerfulpartofthefilmlooksatthedrasticallyshrinkingorcapopulationaroundtheworldandattributesthedecrease,inevitably,topollutionandhumanenterprisethatupsetsnature'sdelicatebalance.AlthoughPCBswerebannedinthe'70s,thechemicals,aswellasothercontaminantsintheairandwater,canremaininanorca'ssystemfordecades,whichhasresultedincalvesbornwithbirthdefects. Themorechallengingissue,andtheonethatevenmoretellinglyshowsthefragilityofnature'sinterconnectedness,hastodowiththefateofthesalmonpopulation.InthePacificNorthwest,forexample,salmonhavebeentheorca'smainsourceoffood.Weallknowthatthesalmonpopulationisdecreasing,butasCousteauandotherscientistscontend,partofthereasonthefisharedecreasingisthatmanhascreatedsalmonfarmswhichhaveactuallyhurtwildsalmonbecausethecultivatedfishhogallthefoodinsharedwaters.…