The name suggests than they stole eggs, but it turns on this was given in error; a suspicious circumstance was misinterpreted and a mother dinosaur was actually guarding her own eggs. (The genus should be renamed Ovigregor.)Best guess would be lizards, carrion, early mammals, some of the larger insects.
There was a mass extinction, killing of the dinosaurs before early hominids (humans) came along.
An early Jurasic dinosaur
Roy C. (Chapman) Andrews found a nest of Protoceratops eggs in the Gobi Dessert, in Mongolia between 1922 and 1925. The eggs where eventually revealed to be Oviraptor eggs in later studies. Though he originally went there to find evidence of ancient man, which he did not find, what he did discover where dinosaur bones, many of which had never been seen before.
251 million years ago was the time of the Permian Extinction, the single largest extinction of biological life in the history of Earth. Before the extinction the dominant animals were probably therapsids, mammal like animals that were either mammals or the ancestors of mammals.
Same early as we do
buffaloes were killed near extinction in the early 1900s
Platypuses have never been endangered. Even when they were close to extinction in the early 20th century, they were not classified as endangered, as this was before official conservation measures were in place.
Cryolophosaurus, from the early Jurassic.
yes, there are many periods. Check in Wikipedia
Macroplata was an early plesiosaur. Their diet consisted of fish.
Yes, the dinosaur fossil found in the Transantarctic Mountains in the summer of 1991 was the Cryolophosaurus. It was a large theropod dinosaur that lived during the Early Jurassic period, and its discovery provided valuable insights into dinosaur evolution in polar regions.