Cover,©agefotostock/SuperStock;3,©PeterCade/Iconica/GettyImages;4,©GeorgeGrall/NationalGeographic/GettyImages;5,©LouKrasky/APImages;6,©CarolHughes/BruceColeman;7,©EarlNottingham/TexasParksandWildlifeDept./APImages;8,©Creatas/SuperStock;9,©LuizC.Marigo/PeterArnold,Inc.;10,©DougPerrine/PeterArnold,Inc.;11,©BrandonCole/VisualsUnlimited;12,©MasaUshioda/VisualsUnlimited;13,©agefotostock/SuperStock.Copyright©byHarcourt,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopy,recording,oranyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.RequestsforpermissiontomakecopiesofanypartoftheworkshouldbeaddressedtoSchoolPermissionsandCopyrights,Harcourt,Inc.,6277SeaHarborDrive,Orlando,Florida32887–6777.Fax:407-345-2418.HARCOURTandtheHarcourtLogoaretrademarksofHarcourt,Inc.,registeredintheUnitedStatesofAmericaand/orotherjurisdictions.PrintedinMexicoISBN10:0-15-350291-6ISBN13:978-0-15-350291-0OrderingOptionsISBN10:0-15-349940-0(Grade5ELLCollection)ISBN13:978-0-15-349940-1(Grade5ELLCollection)ISBN10:0-15-357329-5(packageof5)ISBN13:978-0-15-357329-3(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891012612111009080706byClydeHathers3Overtheyears,thenumberofdifferenttypesofanimalsintheworldhasbecomesmaller.Manyspeciesofanimalshavebecomeendangered.Anendangeredspeciesisaspeciesthatisclosetobecomingextinct.Extinctionmeansthattherearenomoreofaspeciesleftontheearth.Aspeciescannevercomebackonceitisgone.Themorewelearnaboutendangeredspecies,themorewecanhelpanimalssurvive.4RidleySeaTurtleHaveyoueverbeentoanaquariumorzoo?Ifyouhave,youhaveprobablyseengiantturtlesswimming.Someoftheturtlesarev...