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Dinosaurs are the extinct animals that inhabited our planet 225-65 million years ago (during mesozoans period).

In ancient times people considered these bones to be the remains of the heroes of the Trojan War. During medieval times and till the 19th century these bones were considered to be the remains of giants that were mentioned in the Bible and that died during the Deluge.

According to the recent investigations from the USA Universities, dinosaurs the remains of which palaeontologists find died because of suffocation.

Dinosaurs became extinct in the end of Cretaceous period near 65 million years ago. There is no one point of view on the reason for their extinction, scientists are not even sure either they died out gradually or suddenly. This point is the point of discussions nowadays.

These animals are rather popular all over the world till nowadays despite the fact they are extinct. Nevertheless these animals are popular characters of cartoons, myths, legends and films that become rather popular.

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Some interesting facts

The appearance of dinosaur's ancestors took place during the mass extinction of therapsids. The developed forms of therapsids were rather similar to mammals. And according to some theories they even had the breasts for feeding and hair that covered their bodies.

Dinosaurs had the characteristic features of several groups of animals that we know today. They had the features of crocodiles, lizards, mammals and birds. In general their skull is built as the skull of lizards but each tooth was put in the separate cell as crocodile's ones. Crocodiles also have similar features with the features of dinosaurs. They are covered with similar skin with which the body of some of dinosaurs was covered. The system of dinosaurs bones was similar to the mammal's ones. But by the look and built of their legs dinosaurs reminded birds.

Till nowadays scientists disagree on whether dinosaurs were warm-blooded or cold-blooded creatures.

Some dinosaurs had the social behaviour. Nowadays the most ancient dinosaurs with the social behaviour were Psittacosaurus that lived 130-100 million years ago. The discoveries allow making the conclusion that dinosaurs had also the parental instinct.

There are several theories on the extinction of dinosaurs. According to one of them, dinosaurs disappeared in the result of the global catastrophe that was the fall of the giant meteor.