Dinosaurs were considered to be the biggest of all the animals ever came on earth. Though they were huge still, they didn’t develop a good brain. They didn’t know how to survive and save themselves from their enemies. Some scientists even believe that they disappeared due to climate changes, even the swamps dried up and they couldn’t live on vegetation since most of these dinosaurs were vegetation.
Their food supply also disappeared. The earth started having seasons which were not fit for dinosaurs survival. So, dinosaurs could not survive.
Below Dinosaurs info from Wikipedia (Read More):-
Dinosaurs (Greek: δεινόσαυρος, deinosauros) were the dominant vertebrate animals of terrestrial ecosystems for over 160 million years, from the late Triassic period (about 230 million years ago) until the end of the Cretaceous period (65 million years ago), when most of them became extinct in the Cretaceous–Tertiary extinction event. The 10000 living species of birds may be classified as dinosaurs.
The term "dinosaur" was coined in 1842 by Sir Richard Owen and derives from Greek δεινός (deinos) "terrible, powerful, wondrous" + σαῦρος (sauros) "lizard". It is sometimes used informally to describe other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs, and the aquatic ichthyosaurs, plesiosaurs and mosasaurs, although none of these animals were dinosaurs. Through the first half of the 20th century, most of the scientific community believed dinosaurs to have been slow, unintelligent cold-blooded animals. Most research conducted since the 1970s, however, has supported the view that dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. The resulting transformation in the scientific understanding of dinosaurs has gradually filtered into popular consciousness.
http://en.wikipedia.org/wiki/Dinosaur
