How do you describe dinosaurs?

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 Dinosaur world


 Introduction to dinosaurs :

 Dinosaurs are large, extinct reptiles.Dinosaurs lived for approximately 180 million years on planet Earth, and their appearance began during the Mesozoic Era, that is, approximately 245 million years ago،  The origin of the dinosaur being given this name goes back to the Greek language, as the word (deinos) means something that is so huge that it causes terror, while (sauros) is applied to lizards or re

What are 5 facts about dinosaurs?

How do you describe dinosaurs?
How do you describe dinosaurs

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  The name (Dinosauria) in 1842 AD included 3 reptiles that shared its size and were distinguished from other known reptiles.The number of types of dinosaurs currently called ranges between (800-1000) species،  All information about it came through searching for its fossils spread across all continents of the world.It is also believed that the species known in the present constitute only a small percentage of the species that actually lived previously. 

Types of dinosaurs

Information about dinosaurs

  Dinosaur sizes:

 The sizes of dinosaurs currently discovered varied between small dogs and gigantic with the size of monsters.It is believed that extinct dinosaurs are only non-flying dinosaurs, while other dinosaurs remained and evolved into types of birds،  Some fossils also indicate that some dinosaurs actually had feathers.

  Stages of discovering dinosaurs :

 The discovery of dinosaurs went through many stages, and people's minds were completely empty of any idea about these strange creatures before 1842 AD،

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  The following are the stages of discovery in detail:

 At the beginning of the discoveries, some people found bones and remains of dinosaurs before the stage of discovering their true nature, but they did not realize at the time which animals were returning،  This includes what happened in 1676 AD when Robert Plaut found and drew dinosaur thigh bones, after he guessed that they belonged to huge elephants from the Roman era،  Dinosaur bones were also found in New Jersey at the end of the 18th century.

What defines a dinosaur?ptiles in general. 

  Many dinosaur remains and traces dating back to various times from the beginning of the nineteenth century were also found, some of which have been preserved until now،  But these discoveries never reached a taxonomic level at that time.The motivation for the research was pure hobbies, and no one was able to collect entire parts of the dinosaur،  Rather, the discoveries were only scattered parts.

  This continued until Richard Owen concluded in 1841 that these parts belonged to a distinctive type of large reptile that did not resemble any of the reptiles known at the time, and he considered them a separate type in itself،  It was also first called dinosaurs in 1842 AD by the British Association for the Advancement of Science.

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 Classification start stage : 

 The currently approved classification of dinosaurs is based on the hip.This classification was proposed by scientist Harry Shelley in 1888 AD, but the classification stage began differently and gradually progressed until this classification was adopted،  This stage began in 1868 AD.

  Dinosaurs were then divided into only two parts:

  Carnivorous dinosaurs or megalosaurids, and small bird-like or neat-jawed carnivorous dinosaurs (Compsognathus).

  In 1887, dinosaurs were classified into two different parts:

 Saurischia are characterized as dinosaurs with troughs similar to ornithischia reptiles.They are characterized as dinosaurs with troughs similar to birds, and a number of subspecies descend from these two main sections،  It was also known at that time that there were two types of dinosaurs: carnivores and plant-eaters, and thus a classification was known on another basis in the same period.

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  The stage of American discoveries:

  It was the stage of the initial discoveries of dinosaurs in Europe, and after a while another stage of discoveries began in North America, and the American Joseph Liddy began giving many names to types of dinosaurs،  However, some of these names have disappeared because they are not based on compl

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 Liddy studied and described hadrosaurs, also known as the fold-billed dinosaur, as he thought they were amphibians،  The Americans Cope and Marsh adopted a method of searching and excavating dinosaur remains in arid, open places in vast deserts.

  This method is considered one of the very intelligent methods of research, and thus these two scientists became pioneers in finding new dinosaurs, and giving each of them a distinctive name،  This was followed by a number of American efforts to discover other species in various locations, including the efforts of Canon City.

  Marsh's discoveries are a representative group of the most important and prominent types of dinosaurs deployed in the Mesozoic era.As for Cope's discoveries of dinosaurs, they were less despite his distinguished achievements in the field of research and excavation of fossils،  He also created a number of dinosaur names adopted until the present time, and focused on searching rugged areas in eastern Montana.

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  The stage of studying the ancestors of dinosaurs:

  Dinosaurs did not have known ancestors during the first research and discovery journey, due to their radical difference from other living organisms and even from other reptiles, as their relationships are difficult to distinguish adequately،  In addition, sources of information were scarce and based on only the few available specimens, and some assumed that they shared origins with crocodiles, and others believed that they should share ancestors with birds.

ete dinosaur skeletons.

  All studies related to the ancestors of dinosaurs are merely assumptions that do not rely on a solid scientific basis, because determining this accurately requires knowing the first dinosaur ever and knowing the last dinosaur as well accurately،  This may be impossible, as the dinosaur fossil record still contains many time gaps that cannot be explained yet, and thus it is not possible to provide an accurate gradual sequence in this regard.

  Modern era stage :

 The modern era includes many studies and efforts that focus on classification and comparison of previously discovered dinosaur species, and the search for new species is still ongoing،  The efforts of scientists in this era focus on analyzing and describing relationships.

  Dinosaurs evolved to build a single hierarchy for this animal, based on genetic analysis and specialized anatomical studies, to reach a deeper understanding of the nature of dinosaur life.

  Ancestors of dinosaurs :

 Scientists have suggested sharing the origins between crocodiles and dinosaurs due to the convergence of shape and appearance,

 Dinosaurs and crocodiles share anatomically everything that follows:

  Hollow teeth.  Two-hole skull.  An opening in the lower jaw.  This proposal was later denied due to the convergence of the time period in which both crocodiles and dinosaurs appeared, and thus it cannot be said that crocodiles evolved from dinosaurs, or dinosaurs evolved from them at all،  Another proposal was adopted, which best states that dinosaurs descend from Triassic reptiles, namely extinct crocodiles and other flying reptiles, and birds are also one of the products of the evolution of extinct dinosaurs.

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