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 what is the dinosaur?? by Mr.MD

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تاريخ التسجيل : 03/03/2010
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مُساهمةموضوع: what is the dinosaur?? by Mr.MD   الأربعاء مارس 03, 2010 3:45 pm






what is a dinosaurs??



Dinosaurs are all those animals that arose from a common reptilian ancestor that had developed a hole in the bone of its hip socket (right). This hole could exist because of the upright posture of the the animals which transmitted forces up the leg to the top rather than the side of the socket.

Below is an example of a dinosaur, one that has this hole in its hip. This is Deinonychus antirrhopus, a close relative of Velociraptor - the "raptor" of the movies Jurassic Park and Lost World.
What is a Dinosaur?



Dinosaurs were several types of extinct prehistoric reptile that lived 230–65 million years ago. But did they completely die out or do they live among us today in the form of birds? And could scientists recreate a T. rex from fossilised amber? Find out the answers to these and many other questions in our collection of articles, fact files and webcasts. Plus discover the secrets of other extinct species, such as the dodo and the giant sloth.




Dino Directory

Which dinosaurs lived in Britain and the rest of the world? Check out our guide to over 260 dinosaurs organised by body shape, country, time or using the A-Z.




Ida - the clue to primate evolution?

Ida is the best-preserved fossil primate ever to have been found. Find out about the rainforest world she lived in and what she can tell us about our own ancestry.




Non-dinosaur reptiles

Many ancient reptiles are often confused with dinosaurs but they do not have the physical characteristics which define a true dinosaur. Find out more about these animals.




Dino-birds

Are today’s birds descendants of the dinosaurs? Explore the evidence that proved exactly that.




Big teeth for a tiny dinosaur

A tiny dinosaur with big canine teeth shows for the first time how one of the earliest dinosaurs grew into an adult. Watch the video.




Earth Lab Datasite - fossils

Find out about fossils, minerals and rocks discovered in your local area with the Earth Lab database.




T.rex: the killer question quiz

Take the killer question quiz and decide for yourself whether you think T.rex was a scavenger, predator or even both.




Virtual specimens

Examine our virtual specimens, from fossilised trilobites to the bizarre Anomalocaris that stalked the seas 540 million years ago.




Ostrich dinosaurs

Mosts therapods were meat-eaters but ostrich dinosaurs may have been different. Museum palaeontologist Paul Barrett discusses the evidence.




The search for DNA in amber

Scientists discuss the controversial debate over whether dinosaur DNA really can be extracted from the fossilized resin of ancient trees.




Uncovering baryonyx video - 11/01/2008 (video)

Find out how the tools and techniques have changed in 23 years as a team from the Museum excavate a Baryonyx dinosaur.





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