Thedocumentarydepictsmonarchbutterfliesgreatandmysteriousmigration.Eachyearsautumn,millionsofmonarchbutterfliesstarttheirincrediblesouthwardmigrationfromCanada,crossAmerica,toMexico.Theyflyabove2,000milestoarrivethemountainofMexico.....ThefilmopenswithcaterpillarsmunchingmilkweedinsouthernCanadainlatesummer.Sooneachcaterpillartransformsitselfintoasilkychrysalis.Roughly10dayslater,adelicatefour-wingedmonarchemerges.Then,atsomeunknownsignal,themonarchstaketotheaironatwo-month,2,000-mileflightoverfields,forests,cities,plains,openwater,deserts,andfinallymountainstocongregateinatiny,high-altituderegionofcentralMexicowheretheyveneverbeenbefore.Incredibly,theyarrivebythemillionsatthesametimeeachyear.Sheddinglightonthisnaturalwonderaresomeoftheworldsleadingmonarchresearchers,includingLincolnBrowerofSweetBriarCollege,independentbiologistBillCalvert,andOrleyChipTayloroftheUniversityofKansas.Puttingthemonarchphenomenonintoperspective,Taylorsays,YouvegotabutterflythatsoriginatinginToronto,oritsoriginatinginDetroit,Michigan,oritscomingdownfromSt.PaulormaybeevenWinnipeg,anditsmovingsouth.SomehowitfindsitswaytoMexico.Couldyoudothat?Nooneyetknowshowthebutterfliesdoit,butTaylorsresearchrevealsthattheyareexpertnavigators.Inoneexperiment,hetransportedMexico-boundmonarchsfromKansastoWashington,DC,andthensetthemloose.Atfirst,theyflewsouthasiftheywerestillinKansas—acoursethatfromWashingtonwouldmissMexicoentirely.Butafterafewdays,theycorrectedtheirflightpath,asifsomeinbornGPSunithadalertedthemtothetruedirectionoftheirdestination.Inanothersequence,NOVAaccompaniescelebratedmonarchwatcherBillCalvertaroundbackcountryTexasashelooksforsignsofthemonarchmigration.Sureenough,theyshowupenmasseandontime,headingtowardtheSierraMadremountainsacrosstheborder—(🍧)thelastlegoftheirflight.AndintheMexicanstateofMichoacán,NOVAjoinsmountainvillagersastheycelebratethearrivalofthemonarchsinthefirstweekofNovember.ThebutterfliesarrivalmarksthestartofacelebrationcalledtheDayoftheDead,sincethelocalpeoplehavetraditionallyassociatedthemonarchswiththereturningsoulsoftheirdepartedancestors.Unfortunately,illegalloggingintheMexicanbutterflysanctuariesthreatenstheuniquehabitatthatmonarchsdependonfortheirsurvival.Monarchsmaynotyetbeanendangeredspecies,buttheirannualmigrationisanendangeredphenomenonthatcoulddwindletoinsignificanceifthegiantfirsthattheyclingtoduringthewinterdisappear.Gonealsowouldbethecolorfulfestivalthatclosestheprogram—(🏴)afireworksdisplaywelcomingthehardyflierstoMexico,withorangeburstsagainsttheblacksky,lookingalmostlikethebeautifulcloaksofthemonarchs..他(tā )猛(🛸)地(dì )向前一跃，同(tó(🔍)ng )时将(⛏)长(👤)枪向后(🥂)一(💬)(yī )挥，枪(👰)身如同一条灵活(🧠)(huó )的鞭子(🗣)，朝着身(😉)后的身影(yǐng )抽去。黄雷微(🚖)微抱怨，说完，坐到了(le )陈(🍦)健边(📆)上开(kāi )始抽(🍛)烟。不客(🖇)气，小(xiǎo )姑娘开心点，我女儿(😟)跟你(🖌)差不多(✊)大，高(gāo )中估计都考不上(㊙)呢，每(🤑)天不(bú )还是(♎)开开心心。26岁的约翰·(🔍)琼斯(sī )是名(míng )洞穴探险家，他喜欢挑战各(🍼)种不同大小的(de )洞(☔)穴(😏)攀爬。肖战(😪)抿(mǐn )唇，俊逸的眉宇间浮(✉)现(xià(🙃)n )一丝笑意：没关(✋)系(xì )，我喜欢用强。三年前，云岚宗少宗主纳兰嫣然贸然退婚，倍感耻辱的萧(xiāo )炎遂与(💢)纳兰嫣然定下三年之约时日过去，丛(🛬)昕当上顶(🌵)(dǐng )尖医院安妮(😭)医院的(de )小(xiǎ(㊗)o )儿外科(📇)顾问医生，而一心(🙌)捍(hàn )卫(🚏)生命(mìng )的(de )甘(🍸)枫却(🤩)于一间(‼)二线医院落脚，两人本来各走(🤽)各(🆚)路，岂料因一宗肝(gān )移植手术而再次碰头，命运(🗞)亦从此(🤭)连(lián )上(🉑)教室和食(shí )堂都没有他(📴)的(🥚)身影。