About dinosaurs

    heater123
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    About dinosaurs Empty About dinosaurs

    Post by heater123 on Thu Jul 16, 2009 4:06 am

    Millions of years ago, long before there were any people, there were dinosaurs. Dinosaurs were one of several kinds of prehistoric reptiles that lived during the Mesozoic Era, the "Age of Reptiles."
    Dinosaurs were reptiles and most hatched from eggs. No dinosaurs could fly and none lived in the water.

    Plant-eating sauropods were the largest animals to ever walk on Earth - but blue whales are more massive than any of the dinosaurs were! The largest dinosaurs were over 100 feet (30 m) long and up to 50 feet (15 m) tall (like Argentinosaurus, Seismosaurus, Ultrasauros, Brachiosaurus, and Supersaurus). The smallest dinosaurs, like Compsognathus, were about the size of a chicken. Most dinosaurs were in-between.
    It is very difficult to figure out how the dinosaurs sounded, how they behaved, how they mated, what color they were, or even how to tell whether a fossil was male or female.
    No one knows what color or patterns the dinosaurs were.

    Most dinosaurs were plant-eaters (also called herbivores). For example, Triceratops was a plant-eating dinosaur.


    Some dinosaurs were meat-eaters (also called carnivores). For example, T. rex was a meat-eating dinosaur. There were lots of different kinds of dinosaurs that lived at different times.
    Some walked on two legs (they were bipedal), some walked on four (they were quadrupedal). Some could do both.
    Some were speedy (like Velociraptor), and some were slow and lumbering (like Ankylosaurus).
    Some were armor-plated, some had horns, crests, spikes, or frills.
    Some had thick, bumpy skin, and some even had primitive feathers.

    The dinosaurs dominated the Earth for over 165 million years during the Mesozoic Era, but mysteriously went extinct 65 million years ago. Paleontologists study their fossil remains to learn about the amazing prehistoric world of dinosaurs.

    When the dinosaurs lived, the Earth's continents were jammed together into a supercontinent called Pangaea and the Earth was warmer than it is now.





    The dinosaurs went extinct 65 million years ago, probably because of the environmental changes brought about by an asteroid hitting the Earth. The dinosaurs went extinct about 65 million years ago, at the end of the Cretaceous period, which was a time of high volcanic and tectonic activity. There are a lot of theories why the extinction occurred. The most widely accepted theory is that an asteroid impact caused major climactic changes to which the dinosaurs couldn't adapt.
    Dinosaurs probably live on today as the birds. All that's left of the dinosaurs are fossils and, perhaps,the birds. Dinosaur fossils have been found all over the world, maybe even near where you live!
    Some dinosaurs were very bird-like and may be the ancestors of today's birds.

    There are almost 500 described dinosaur genera and many more species. Every few months (sometimes weeks), new finds are unearthed. Although dinosaurs' fossils have been known since at least 1818, the term dinosaur (deinos means terrifying; sauros means lizard) was coined by the English anatomist Sir Richard Owen in 1842. The only three dinosaurs known at the time were Megalosaurus, Iguanodon, and Hylaeosaurus, very large dinosaurs.
    The oldest known dinosaur is Eoraptor, a meat-eater from about 228 million years ago. study study study
    blain
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    About dinosaurs Empty Dino Dig

    Post by blain on Tue Jul 21, 2009 9:07 pm

    Yea I Dig It!! Homie!!!lolz Jk (thats A Joke And you Should Be Laughing)
    Anywho, Cool Facts I Likem Thanks for Sharing Them With Us!!!! Very Happy
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    Post by Puffles on Wed Jul 22, 2009 3:55 pm

    Dinosaurs? Well, isn't the alligator a descendent of an ancient dinosaur? Maybe I am getting my facts wrong. But, anyway, thanks for sharing. Surprised


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    Post by Fame_Fan on Fri Oct 23, 2009 10:21 am

    The dinosaurs were among the most successful animals ever to live on the Earth. Their reign lasted over 100 million years - and if birds evolved from the dinosaurs, then their descendents are still alive today.

    The dinosaurs were among the most successful animals ever to live on the Earth. Their reign lasted over 100 million years - and if birds evolved from the dinosaurs, then their descendents are still alive today.

    When dinosaurs first appeared about 230 million years ago the world was very different. There were very few of the animal groups we recognise today - no mammals, no birds and no lizards. But there were some lizard-like reptiles.
    The difference was also apparent in the plant kingdom. Plant life would have seemed very drab, just green and brown in colour. There were no flowering plants, so nothing like most of the common trees and shrubs today. What trees there were would have looked different, though some were relatives of modern day ferns and podocarps. There was no grass. Instead, low ground cover would have been ferns and mosses.

    The Triassic world was unusual for another reason. About 20 million years before the appearance of the first dinosaurs, the biggest extinction the world had ever known had occurred. Over 90% of all plant and animal species then alive on land and in the sea had died out at this time. Even in the Late Triassic the world was still recovering, and there was not the usual variety of life normally found on earth.

    It took more than 10 million years before ecosystems recovered and complex systems and larger animals took even longer. Most of the dominant land animals that were around when dinosaurs evolved were products of long and established lines of descent.
    The continents of the triassic Earth were configured differently to today. All the land masses on the planet were joined together into one huge continent called Pangaea. This stretched from pole to pole and its central region was a vast inhospitable desert. We know this because the type of rocks that were deposited at this time have sedimentary features characteristic of a dry harsh climate.

    As all the continents were connected, the animals and plants found in the fossil record from that time are very similar all over the world.



    Peteinosaurus caught insects in its pin-like teeth.


    When dinosaurs first appeared about 230 million years ago the world was very different. There were very few of the animal groups we recognise today - no mammals, no birds and no lizards. But there were some lizard-like reptiles.

    What? No grass?
    The difference was also apparent in the plant kingdom. Plant life would have seemed very drab, just green and brown in colour. There were no flowering plants, so nothing like most of the common trees and shrubs today. What trees there were would have looked different, though some were relatives of modern day ferns and podocarps. There was no grass. Instead, low ground cover would have been ferns and mosses.

    The Triassic world was unusual for another reason. About 20 million years before the appearance of the first dinosaurs, the biggest extinction the world had ever known had occurred. Over 90% of all plant and animal species then alive on land and in the sea had died out at this time. Even in the Late Triassic the world was still recovering, and there was not the usual variety of life normally found on earth.

    It took more than 10 million years before ecosystems recovered and complex systems and larger animals took even longer. Most of the dominant land animals that were around when dinosaurs evolved were products of long and established lines of descent.

    A giant desert
    The continents of the triassic Earth were configured differently to today. All the land masses on the planet were joined together into one huge continent called Pangaea. This stretched from pole to pole and its central region was a vast inhospitable desert. We know this because the type of rocks that were deposited at this time have sedimentary features characteristic of a dry harsh climate.

    As all the continents were connected, the animals and plants found in the fossil record from that time are very similar all over the world.



    Peteinosaurus caught insects in its pin-like teeth.




    New life
    The Late Triassic was an innovative time in the animal kingdom. By the end of the period not only the dinosaurs had appeared but also pterosaurs (flying reptiles), various kinds of marine reptiles, the first crocodiles and turtles, and the earliest true mammals.

    Towards the end of the Triassic, 220 million years ago, there was another extinction, which wiped out many of the non-dinosaurs including the dicynodonts such as Placerias and primitive archosaurs such as Postosuchus. It was after this that dinosaurs really started to radiate and diversify.

    Dinosaurs gain the edge
    It was often assumed that the dinosaurs survived due to their superior speed and agility. We now think they were simply fortunate because they were not hit as hard by extinction. After the extinction at the very end of the Triassic, the dinosaurs were the only large land animals left.
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    Post by Plutonio on Tue Nov 24, 2009 3:31 am

    Wow,Interesting Facts
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    Post by billybubble on Fri Jan 29, 2010 6:51 am

    Good topic! Wink

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