They lived 145 million years ago and were at least 20 times the size - but a bunch of old dinosaurs walked long distances to find food, such as wildebeest modern researchers have found.
Herds of Camarasaurus, a long-necked herbivores known as sauropods, traveled nearly 200 miles from the plains to the mountains to find the offer of food and water.
The trip was conducted on a seasonal basis up to 20 tons, 23 meters long animal traveled together across great distances.
The discovery was made by Henry Fricke, head of the department of geology at the University of Colorado, whose works were published in the journal Nature.
His research shows long-term researchers to believe that dinosaurs roamed the dry season, much like a modern herbivores, including wildebeest and caribou.
"I think it would have been rather slow time with the animals to eat, as they went, can only go a few miles at most, as they run up before turning around and heading back downhill" at he told the Times.
"Perhaps, at this rate could keep small and can be protected from predators by staying close to their parents enormous."
Isotopes found in tests conducted by the teeth enamel of dinosaurs, Dr. Fricke found that Camarasaurus lived both in the plains, where the dinosaur fossils were found, and the mountains about 200 miles.
Fossils of 145 years, which were found in the western United States, show that the herd had been drinking water from regions of high altitude and low altitude desert.
Dr. Fricke said that the trip would have been the plains and plateaus of noisy and smelly.
"I think a lot of noise - rustling of the trees as the leaves they eat, and lots of fart: the sauropods did not chew - they did their digestion in the gut," he said.
The research team, based in Colorado Springs, it is proposed to test the theory by studying the population Camarasaurus less arid environments.
They also carry out tests on the fossil teeth of predatory dinosaurs with the same isotope components, to see if they have followed their prey migration.
Camarasauraus means "lizard cameras," the Greek "dome camera," in reference to the inner cavities of the vertebrae of a dinosaur.
The species is derived from the Late Jurassic, and fossils are most commonly found in North America.
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Posted by Dinosaurs World at 9:37 PM