There are many theories trying to explain the disappearance of dinosaurs. The most widely accepted one today is the theory proposed by the Nobel prize-winning physicist Luis Alvarez and his son geologist Walter Alvarez. It assumes that the mass extinction of dinosaurs was caused by the impact of a large asteroid on the Earth sixty-five million years ago.

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People have been finding dinosaur fossils for hundreds of years, probably even thousands of years. There are references in ancient writings to 'dragon' bones found in China over two thousand years ago, and these too most likely belonged to dinosaurs.

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There where no flying dinosaurs at all, but there were many flying reptiles that lived during the time of the dinosaurs.

Pterosaurs are the earliest vertebrates known to have evolved powered flight. Other flying reptiles where: Plesiosaurus, Pteranodon, Pterodactylus, Dimorphodon, Rhamphorhynchus, Quetzalcoatlus, and others!

The world of dinosaurs! Dinosaur Pictures - flying dinosaurs!

What do you thing, how many teeth? Wow! Now you'll be appalled. Tyrannosaurus rex had more than 60 teeth, and each one was about 23 cm long. The length of its gaping jaws was 1.2 m.

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