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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者，还有
2、荤素都吃的杂食性恐龙。Dinosaur ProfileDinosaursappeared in two hundred forty-fivemillionyears ago, andprosperityat the end of the Mesozoic reptiles65 millionyearsago. ,Or dinosaurs,and withitthe same eraplesiosaurs,pterosaursandotherfuzzy generic term.Dinosaurs inthe Cretaceous period ended65 million years ago
3、 when all of a sudden disappeared, a mysteryof the evolutionary history of life on Earth, is still without aperson who can answer this mystery. Creatures of the Earth in thepast,arebeing recorded in the fossil.Mesozoic strata,thatmanydinosaur fossils have been found. Where you can see the bones ofla
4、rgeor presentsa wide range ofshapes. However, in the followingCenozoicstrata,butcompletelyseelessthanthefossilsofdinosaurs. We concluded that with the extinction of the dinosaursin the Mesozoic.Many kindsofdinosaurs,body shape and habitsalsobigdifference.Large sub thendozens of elephantstogether;sma
5、ll,butwith almosta chicken. Docile herbivorous, feeding habits,The meat eaters and violent, as well asmeat and vegetables toeat精选资料，欢迎下载。omnivorous dinosaur.精选资料，欢迎下载。Dinosaurs,one of the most successful groups of animals (interms of longevity) that have ever lived,evolved into manydiverse sizes and
6、 shapes,with many equally diverse modes ofliving.ThetermDinosauriawas inventedby SirRichardOwenin 1842to describethesefearfullygreatreptiles,specificallyMegalosaurus,Iguanodon,andHylaeosaurus,theonly three dinosaurs known at the time.The creatures that wenormallythinkofasdinosaurslivedduringtheMesoz
7、oicEra,from late in the Triassic period (about 225 million yearsago) until the end of the Cretaceous (about 65 million yearsago).But we now know that they actually live on today as thebirds.Some things to keep in mind about dinosaurs:? Noteverythingbigand dead isa dinosaur.Alltoooften,bookswritten(o
8、r movies made) fora popular audienceincludeanimalssuchasmammoths,mastodons,pterosaurs,plesiosaurs,ichthyosaurs,andthe sail-backed Dimetrodon.Dinosaurs are a specific subgroupofthearchosaurs,agroupthatalsoincludescrocodiles,pterosaurs,andbirds.althoughpterosaursarecloserelations,theyarenottruedinosau
9、rs.Evenmoredistantly related to dinosaurs are the marine reptiles,which精选资料，欢迎下载。includethe plesiosaursandichthyosaurs.Mammothsandmastodons are mammals and did not appear until many millionsof years after the close of the Cretaceous period.Dimetrodonis neithera reptilenora mammal,but a basal synapsi
10、d,i.e.,anearly relative of the ancestors of mammals.? Notalldinosaurslivedat thesame time.Differentdinosaurslivedatdifferenttimes.Despitetheportrayalsinmovies likeKingKong and JurassicPark,noStegosauruseversaw aTyrannosaurus,becauseTyrannosaurusdidntappearonthescene until 80 or so million years foll
11、owing the extinctionof stegosaurs.The same goes for Apatosaurus (Brontosaurus) its bones were already well-fossilized by the time T.rex came along.? Dinosaurs are not extinct.Technically.Based on features oftheskeleton,mostpeoplestudying dinosaurs considerbirdstobe dinosaurs.Thisshocking realization
12、makes even thesmallesthummingbirdalegitimatedinosaur.Soratherthanrefertodinosaurs and birds as discrete,separate groups,it is besttorefertothetraditional,extinctanimals asnon-aviandinosaurs and birds as,well,birds,or avian dinosaurs. Itis incorrect to say that dinosaurs are extinct,because theyhaveleftlivingdescendantsintheformof精选资料，欢迎下载。cockatoos,cassowaries,andtheirpalsjustlikemodernvertebrates are still vertebrates even though their Cambrianancestors are long extinct.
