Dinosaurs

it is estimated that bruhathkayosaurus weighed 139 metric tonnes. earlier estimates had it at 170-240 tonnes, but these are considered to be exagerrated. perhaps one day we could fine even larger bones, but until than, bruhathkayosaurus (if its real) would have been the heaviest land animal ever.

No land animals (vertebrates) existed 440 million years ago. Lots of sea life, though. Bugs also started to appear about that time. Some scientists speculate a hypernova explosion may have caused a mass extinction of most of the life on Earth 440 million years ago.

Troodon was a very peculiar animal, and so paleontologists and scientists are in disagreement over what it ate. Most think it was a carnivore, and so ate other dinosaurs, eggs and reptiles. However, others suggest, because of its similarities with omnivorous lizards today, it was an omnivore, and so ate both plants and animals.

There were more species of plant eating dinosaur than there were species of carnivorous dinosaur. Additionally, the populations of carnivores would have been much smaller than the populations of similarly sized herbivores.

No. Dinosaurs first emerged about 230 million years ago and, with the exception of birds, went extinct about 65 million years ago. The first human-like creatures appeared about 5 million years ago.

It depends to whom you talk. Some people think dinosaurs is a subject that is not needed and some others think that they are amazing and so alien that it's cool. I think it's their sheer size and power that captivates people.

The name Pterosaurs, often referred to as pterodactyls existed from the late Triassic to the end of the Cretaceous period (220 to 65.5 million years ago). They included the very small Nernicolopterus to the largest known flying creatures of all time, including Quetzalcoatlus and Hatzegopteryx. See the related links for more information.

However, technically the pterosaurs were not dinosaurs but a separate group of reptiles. The first known true dinosaur to fly was archeopteryx, the earliest known bird.

You bet birds and mammals evolved from early reptiles.

The archaeopteryx is a great example of an intermediate species between birds and reptiles, displaying the characteristics of both in a well preserved fossil.

About 90 million years ago a meteor that was bigger than Mt Everist slamed into Mexico's Yucitan Penisula.

It's Mt. "Everest" and it was more like 65 millions years ago......

And it's spelt Mexico's Yucatan Peninsula

Iguanodon is famous for its thumb spikes. When the first Iguanodon thumb spike was found, it was believed to be a horn, because one of the spikes was missing. Later the error was corrected.

That's a really good question; one to which nobody knows the sure answer. Probably longnecks didn't sleep very much because they had to eat pretty much all the time, but they surely took naps some of the time.

They probably slept standing up, like elephants, although when really tired they might have knelt on their knees. They certainly did not sleep on their sides of backs as it would have been too difficult to get up.

What did they do with those long necks? They MAY have rested their heads on the ground, but it's more likely that they used raised land or vegetation to prop their noggins up. Since they almost certainly lived in herds, it's possible they laid their heads on each other, some snoozing while their herdfellows kept watch.

They evolved in the Triassic and mainly spreadout to dominate the Erath in the Jurassic most people will say this is the golden age of the dinosaurs, however I'd say the early-mid creataceous is, it's when all the weird species came

Are you referring to a bulky, short legged herbivorous dinosaur covered with bony knobs that were used as protective armor? If so, then you are thinking of some type of ankylosaur. Of course, the most famous ankylosaur is Ankylosaurus, but any type of ankylosaur would fit the above description.

There are no dinosaurs are found in the Philippines

When a dino dies, it becomes a fossil. We know that the dinosaurs existed because they left behind fossils we see today.

10. Carcharodontosaurus

9. Kronosaurus

8. Deinonychus

7. Allosaurus

6. Megalodon

5. Mapusaurus

4. Spinosaurus

3. Giganotosaurus

2. Tyrannosaurus Rex

1. Utahraptor

Yes and know. Most dinosaurs died of in a massextinction about 65 and a half million years ago. The oldest human ancestor or hominids found is about 3 to 4 millions years old. Some may have survived the mass extinction and others may have evolved into birds, fish and reptiles.

Dinosaurs were not the first creatures to walk the earth, they were preceded by countless other animals, including our synapsid relatives, early tetrapods and of course, the insects. By the time dinosaurs appeared the Earth had already seen a multitude of living beings come and go.

Triceratops existed from 68 to 65.5 million years ago. That was at the end of the Maastrichtian stage, the last stage of the Cretaceous period, which was the last period of the Mesozoic. In fact, Triceratops existed at the very end of the Mesozoic era and was one of the dinosaurs wiped out by the K-T extinction.

Paleontologists study the long-gone species of the animal or plant kingdoms, paleobiologists studying the long-gone species of the animal kingdom, while paleobotanists study the long-gone species of plants. Their job is to find evidence of these creatures ever existing, and also to find out how the lived, what they ate, how they might have looked like, etc. Some paleontologists do dig up bones of not just dinosaurs, but all kinds of animals. Others do other stuff.

the biggest known dinosaruis supersaurus allthough we suspect that we only know 10% of all prehistoric life and bigger and better finds are made every day in the world of paeleontology so who knows what the answer to this question will be in a few years time but fornow supersaurus is the best answer we paeleontologists can give.