Manywildanimalsarefacingthedangerofextinction,becausetheenvironmentthattheyarelivinginhaschangedgreatly.Forexample,withthedevelopmetofcities,theusingofinsecticideandseriouspollution,theirlivingareashavebecomenarrowcrandnarrower.Manyofthewildanimals,nowareconfrontedwithfoodcrisis.Atthesametime,maniskillingoffspeciesjustforgettingtheirfur,skin,horns,teethandmeat.Thisis,anyway,adefiniteresultofpopulationgrogrowthandenvironmentpollution.Withtheincreaseofpopulation,peopleneedmoreandmorelandtogrowcropsandmorespacetolivein.Thus,thereislessandlessroomintheUSAforwildlifetosurvive.Withtherapiddevelopmentofagricultureandindustry,theenvironmentisseriouslypolluted,whichdestroysthelivingconditionofwildlife.Therefore,thephenomenonofwildlifeextinction,inasense,shoulddrawpeople'sconsideration.Inordertoprotectourresourcesofecology,Tosolvetheproblem,boththegovernmentandthecitizentsshouldmakeeffortstogether.Thegovernment,mostimportantofall,needstotakesomemeasurestocontrolthebirthratesothattherewillbemoreroomforwildlifespecies.Thecitizens,too,shoulddeveloptheirawarenessofenvironmentprotection.