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1、恐龙简介恐龙是出现于二亿四千五百万年前，并繁荣于六千五百万年前结束的中生代爬行动物。或为恐龙和与它同一时代的蛇颈龙、翼龙等的模糊总称。恐龙在在6500万年前白垩纪结束的时候突然全部消失，成为地球生物进化史上的一个谜，这个谜至今仍无人能解。地球过去的生物，均被记录在化石之中。中生代的地层中，即曾发现许多恐龙的化石。其中可以见到大量或呈现各式各样形状的骨骼。但是，在紧接着的新生代地层中，却完全看不到恐龙的化石。由此推知恐龙在中生代时一起灭绝了。恐龙种类多，体形和习性相差也大。其中个子大的，可以有几十头大象加起来那么大；小的，却跟一只鸡差不多。就食性来说，有温顺的草食者和凶暴的肉食
2、者，还有荤素都吃的杂食性恐龙。DinosaurProfileDinosaursappearedintwohundredforty-fivemillionyearsago,andprosperityattheendoftheMesozoicreptiles65millionyearsago.,Ordinosaurs,andwithitthesameeraplesiosaurs,pterosaursandotherfuzzygenericterm.DinosaursintheCretaceousperiodended65millionyearsagowhenallofasudde
3、ndisappeared,amysteryoftheevolutionaryhistoryoflifeonEarth,isstillwithoutapersonwhocananswerthismystery.CreaturesoftheEarthinthepast,arebeingrecordedinthefossil.Mesozoicstrata,thatmanydinosaurfossilshavebeenfound.Whereyoucanseethebonesoflargeorpresentsawiderangeofshapes.However,inthefollowi
4、ngCenozoicstrata,butcompletelyseelessthanthefossilsofdinosaurs.WeconcludedthatwiththeextinctionofthedinosaursintheMesozoic.Manykindsofdinosaurs,bodyshapeandhabitsalsobigdifference.Largesubthendozensofelephantstogether;small,butwithalmostachicken.Docileherbivorous,feedinghabits,Themeateaters
5、andviolent,aswellasmeatandvegetablestoeatomnivorousdinosaur.Dinosaurs,oneofthemostsuccessfulgroupsofanimals(intermsoflongevity)thathaveeverlived,evolvedintomanydiversesizesandshapes,withmanyequallydiversemodesofliving.Theterm"Dinosauria"wasinventedbySirRichardOwenin1842todescribethese"fearf
6、ullygreatreptiles,"specificallyMegalosaurus,Iguanodon,andHylaeosaurus,theonlythreedinosaursknownatthetime.ThecreaturesthatwenormallythinkofasdinosaurslivedduringtheMesozoicEra,fromlateintheTriassicperiod(about225millionyearsago)untiltheendoftheCretaceous(about65millionyearsago).Butwenowknow
7、thattheyactuallyliveontodayasthebirds.Somethingstokeepinmindaboutdinosaurs:•Noteverythingbiganddeadisadinosaur.Alltoooften,bookswritten(ormoviesmade)forapopularaudienceincludeanimalssuchasmammoths,mastodons,pterosaurs,plesiosaurs,ichthyosaurs,andthesail-
