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1、Whydosomeanimalsdieout?Inthepasttwohundredyearspeoplehavecausedmanykindsofanimalstodieout-tobecomeextinct.Peoplekeepbuildinghousesandfactoriesinfieldsandwoods.Astheyspreadovertheland,theydestroyanimalshomes.Iftheanimalscantfindaplacetolive,theydieout.SixteenkindsofHawaiianbirdshavebecomeextinctforth
2、isreason.Otheranimals,suchastheFloridaKeydeer,maysoondieoutbecausetheyarelosingtheirhomes.Huntershavecausedsomeanimalstobecomeextinct,too.Inthelastcentury,hunterskilledallthepassengerpigeonsinNorthAmericaandmostofthebuffalos.Todaytheyarefastkillingoffhawksandwolves.Pollutioniskillingmanyanimalstoday
3、,too.Asriversbecomepolluted,fisharepoisoned.Manydie.Birdsthateatthepoisonedfishcantlaystrong,healthyeggs.Newbirdsarentborn.Sofar,noanimalshavebecomeextinctbecauseofpollution.Butsome,suchasthebaldeagleandthebrownpelican,havebecomerareandmaydieout.Scientiststhinkthatsomeanimalsbecomeextinctbecauseofch
4、angesinclimate.Theplaceswheretheylivebecomehotterorcooler,drierorwetter.Thefoodthattheyeatcannotgrowthereanymore.Iftheanimalscantlearntoeatsomethingelse,theydie.Dinosaursmayhavediedoutforthisreason.Summary:Inthepasttwohundredyears,manykindsofanimalshavediedout.Thereareseveralreasonsforit.First,peoplekeepbuildinghousesandfactoriesinfieldsandwoods,whichdestroysanimalshomes.Then,hunterskillinghasalsocausedsomeanimalstobecomeextinct.Besides,someanimalsarentabletobearstrongoffspringandnordotheyhaveenoughfoodtoeatbecauseofpollutionandclimaticchanges.