WhenIwasveryyoung,Isawacartoon,inwhichabigmonsterwastryingtodestroyacity.Iwasshocked,andaskeddadwhatthatwas.ItwasthefirsttimewhenIheardofdinosaurs,andjustfromthatmoment,Iwasinterestedineverythingaboutthem.Ilookeduptheword“dinosaur”inadictionary,andthestatementwasasfollows:Dinosaursarelargeextinctreptiles,whichlivedintheMesozoicEra.Theyhaveanumberofbreedswithdifferentshapes.Someareastallas30meters.TheyalldiedoutattheendoftheMesozoicEra.ThemoreinformationIfound,themoreIknewaboutthem.Dinosaurslivedbetween200millionyearsand35millionyearsago,andhumanbeingsdidnotexistduringthatperiod.Theonlywaypeoplecanlearnaboutdinosaursisthroughfossils.Theburiedbodiesorskeletonsofancientanimalsorplantswouldchangeintospecialstonesaftermillionsofyears.Wecallstonesofthiskindfossils.Thediscoveryoffossilshelpspeoplelearnverymuchvaluableinformationaboutancientcreatures.Peopledigoutfossils,andconcludetheenvironmentdinosaurslivedinandtheircharacters.Somedinosaurslivedintheriver;somelivedintheforest;whileothersdominatedinthesand.Someofthemwerequitegentle,whichlivedonplantsanddidnoharmtoothercreatures;whileotherswereveryfierceandcruelandfedonmeat,whichwerefamousfortheirsharpteethandpawsandcouldtearothersmalleranimalsintopieceswithinafewseconds.Wecommonlyseetheminhorrormovies.Whysuchabigkingdomthatruledthisplanetforabout170millionyearsdisappearedtotally?Evenexpertscannotgiveusasureanswertothisquestion.Therearesomecommonlyacceptedconclusions,suchasasteroidshittingtheearth,atmospherechangingsharply,theydyingofdiseases,volcanoerupting,andmanyotheropinions.Didtheyjustleavethisplanetwithoutanysigns?Explorershavefoundmanystrangefootprintsnotmadebyhumanbeingsindeepforestsandhighmountains.TheyalsotookmanypicturesoflivingcreaturesintheLochNess.Arethesefootprintsmadebydinosaurs?ArethelivingcreaturesintheLochNessdinosaurswhosurvived?Noonecanworkoutthispuzzle.However,onethingisforsure.Manymodernanimalshavethesimilarcharacterstotheancientdinosaurs.Scientistsbelievetheyevolvefromdinosaurs.Ifwekeeponexploretheunknowingareainthisplanet,wemayfindmoreinformationaboutdinosaurs.

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