byTomPoulsonCover,©MARKRAYCROFT/MindenPictures;p.3,©CharlesGeorge/VisualsUnlimited;p.4,©PhotoDisc;p.5,p.8,p.14,©Corel;p.6,p.9,©TomMcHugh/PhotoResearchers,Inc.;p.7,©Corbis;p.10,©GustavVerderber/VisualsUnlimited;p.11,©JohnM.Burnley/PhotoResearchers,Inc.;p.12,©GeorgeMcCarthy/CORBIS;p.13,©MillardH.Sharp/PhotoResearchers,Inc.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.PrintedinChinaISBN10:0-15-351526-0ISBN13:978-0-15-351526-2OrderingOptionsISBN10:0-15-351214-8(Grade4AdvancedCollection)ISBN13:978-0-15-351214-8(Grade4AdvancedCollection)ISBN10:0-15-358116-6(packageof5)ISBN13:978-0-15-358116-8(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891098512111009080706byTomPoulsonIt’sthemiddleofJanuary,andthetemperatureinnorthernAlaskais–25°Fahrenheit(–31°C).Thefrozengroundiscoveredbysnow.Strongwindsblow,makingtheairevencolder.Atnight,thetemperaturedropsevenmore.Acasualobservermightbeluredintothinkingthatthere’snotasinglecreaturealiveinthisharshenvironment.Thatobservationwouldbeincorrect,forundertheground,inasmallburrow,liesanArcticgroundsquirrel.TheArcticgroundsquirrelresemblesthegraysquirrelsthatarecommonintheUnitedStates.Onthisday,thissquirrelintheArcticisnotclimbingatreeorrunningthrough...
