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　　1、ThebluewhaleisthelargestanimalevertoinhabittheEarth.Bluewhalesarefoundthroughouttheworld'soceans.Thesegentlegiantshavegrayish-blueskinwithlightspots.Measuring70to80feetinlength,bluewhalescanweighasmuchas90to150tons,althoughfemalesarelargerthanthemales.

　　2、

　　Thebluewhaleisthelargestmammal,possiblythelargestanimal,toeverinhabittheearth.Itsbodyislong,somewhattapered,andstreamlined,withtheheadmakinguplessthanone-fourthofitstotalbodylength.Itsrostrum(upperpartofthehead)isverybroadandflatandalmostU-shaped,withasingleridgethatextendsjustforwardoftheblowholestothetipofthesnout.Itsblowholesarecontainedinalarge,raised"splashguard",andtheblowistallandstraightandover20feet(6meters)high.Itsbodyissmoothandrelativelyfreeofparasites,butafewbarnaclesattachthemselvestotheedgeoftheflukeandoccasionallytothetipsoftheflippersandtothedorsalfin.Thereare55-68ventralgroovesorpleatsextendingfromthelowerjawtonearthenavel.