The massive herbivore is believed to exist in Triassiku period some 200 million years ago. What is odd about the proper conclusion is that large mammals did not exist in & # 39; this point. Scientists had believed that large mammals died at the end of the Permian Period 251.9 million a year ago.
After that, there were only smaller mammals since the dinosaurs became the dominant species on Earth, and mammals regained the crown about 50 million years ago.
However, the discovery of remains of large & # 39; herbivores found in southern Poland say that large mammals and large dinosaurs must coexist.
The creature was called lisowicia Bojan, and belonged to the same evolutionary branch as mammals.
Grzegorz Niedzwiedzki, paleontologu at the University & # 39; Uppsala in Sweden wrote a paper published in the journal Science, said: "We used to think that after the end of the Permian extinction, mammals and their relatives withdrew to the shadows while increased the dinosaurs grew to enormous sizes. "
The beasts newly discovered are part dicynodont family and lived at the same time as other sauropods, a group & # 39; dinosaur that eventually led to a diplodocus b & # 39; long neck – one of the largest creatures ever lit up the World.
Experts mean that environmental factors during the period Triassiku have led to gigantism worldwide.
Christian Kammerer, specialist & # 39; Dicynodont in Natural Sciences Museum & # 39; North Carolina, said the size of & # 39; Lisowicia was "startling".
"Large Diċnondotti been known before in both the Permian and in the Triassiku, but never in & # 39; this scale.
"B & # 39; in general I think this is really intriguing and important document, and show us that there is still much left to learn about early mammals in the Triassic relatives."