仓鼠：Hamstersarestout-bodied,withtailsshorterthanbodylength,andhavesmallfurryears,shortstockylegs,andwidefeet.Theirthick,silkyfur,whichcanbelongorshort,canbeblack,gray,honey,white,brown,yellow,orreddependingonthespecies,oramixofanyofthosecolors.

蛇：Asnakehasbeenontheearthforover130millionyears.Withoutlimbs,itcanclimb,swimandsometimesfly.Ofthe2700knownspecies,eachsharethreecommontraits.Ithasathin,linearlimblessbody,eatsmeatandiscoldblooded.Ithasanexpandablejawandcanswallowpreylargerthanitselfwhole.

金鱼：GoldfishoriginatedinChinaandJapan,andhavebeenbredtoobtaintheinterestingcolorsandshapesoftoday.Theirskiniscoveredwithcolorfulscales.Theyhavetwokindsoffins:singlefinsonthetailandbacktoprovidestabilizationandpairedfinsoneithersidewhichhelpsteerandguide.Andtheyarenotablygreedyeatersandlearnquicklyabout“feedingtime”.

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