八年级下册英语64页3B作文
Hamstersaremammalswhichbelongtotherodentfamilyhavinglargeincisorteeththatarecontinuallygrowingnecessitatinggnawingtopreventtheteethfromovergrowing.Thewordrodentisderivedfromthelatinwordroderewhichmeanstognaw.HamstersformtheFamilyCricetidaewhichisbrokendownintodifferentGeneraincludingCricetulus,PhodopusandCalomyscus.WithineachGeneraarevariousspeciesofhamster.Therearemanydifferentspeciesofhamstersthroughouttheworldandmosthamstersinhabitsemi desertareaswheretheyliveinburrows.Theseburrowsconsistofmanytunnelsandseparatechambersincludingchamberswherethehamsterwillstorefoodandsleep.Hamstersarenocturnal,sleepingduringthehotdaysandwakinginthecoolerevenings.Theyhaveverypooreyesightbutakeensenseofsmellandexcellenthearing.Mostspeciesofhamstershaveexpandablecheekpouchesinwhichtheycancarryfoodandbeddingbacktotheirburrowwheretheywillstorefood.ThewordhamstercomesfromtheGermanwordhamsternwhichmeanstohoard.Onlyafewhamsterspeciesarewidelykeptaspetsbutthehamsteristhemostpopularofthesmallerrodentskeptasapetinmanycountriestoday.01 您可能感兴趣的内容