濒临灭绝的动物英语PPT课件

.,1,.,2,Doyoulikeanimals?,Havealook,.,3,.,4,Whatdoyouthink?Theyarereallylovely!,Butunfortunately,theyareallendangeredanimal.,.,5,Thetwelvemostendangeredanimalspecies,古巴鳄（Cubancrocodile）,佛罗里达戴帽蝙蝠(Floridabonnetedbat),.,6,绿眼蛙（GreenFrog）,格林纳达鸽（Grenadadove）,.,7,亨氏羚羊(Heinzantelope),犁头龟(Ploughsharetortoise),.,8,苏门答腊猩猩(SumatranOrangutan),岛屿灰狐(Urocyonlittoralis),.,9,白头叶猴Whiteheadedleafmonkey,小头鼠海豚PhocoenasinusNorris,.,10,普氏野马(Equusprzewalskii),罗默小树蛙(Luostreefrog),.,11,Thereareover5000Vertebrate(脊椎动物）animalsarethreatenedorendangered.Manythingscancauseanimalstobecomethreatenedorendangered;Mostproblemsarecausedby,.,12,FollowingaresomemajorPROBLEMS:,FirstProblems:habitatlossHabitatistheecosystem(生态系统）ofanimals,theyneedtoliveinproperplace,suchasswamp,rainforest,desert,etc.Humanreplacetheanimalhabitats,itcouldcauseanextensivelossofrangesforanimals.,.,13,SecondProblem:pollution,Commercialandindustrialoperationscanreducelandandpolluteenvironment.AirpollutionWaterpollution,.,14,ThirdFactor:predationorillegalkilling,Predationmakesanimalsbecomeendangeredisover-fishingorover-hunting.,.,15,ForthFactor:introductionanimal,Manyrarityanimalsareintroducedbypeopletoareaswheretheyneverexistedbefore.Theintroductionofanon-nativespeciestoahabitatmaymakeanimalsbecomeendangered.许多稀有的动物被人们引进到他们从未生存过的地方，引进一个非本地物种到一个栖息地可能使动物濒临灭绝。,.,16,FifthFactor:disease,Introducedanimalsbringnewdiseaseswiththem,becomesanotherreasonofwhyareanimalsendangered.Thenativeanimalscantresistance（抵抗）tonon-nativediseases.Anothercauseofdiseaseischemicals.Somechemicalsdirecteffectonsomeanimalspopulation.,.,17,Whatsyourfeelingnow?Doyouwanttheselovelyanimalslive?Wehavetoknowthatwhenanimalsbecomeendangered,theentirefoodchaincanbeaffected.,ThesefivemajorPROBLEMSareal