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Maiasaura is a characteristic fossil of the middle portion (lithofacies 4) of the Two Medicine Formation, dated from about 86.3 to 70.6 million years ago. [2] Maiasaura lived alongside the troodontids Stenonychosaurus and Troodon and the basal ornithopod Orodromeus, as well as the dromaeosaurid Bambiraptor and the tyrannosaur Daspletosaurus. [2]
One day, a marauding pack of Troodon attack the nesting grounds, snatching and eating the Maiasaura eggs. The mother loses all but two of her eggs, one of which being the egg she saved. When the eggs hatch, one is a male Maiasaura, whom the mother names Light, and the other is a Tyrannosaurus, named Heart.
The scapula did not expand at the upper end but was very expanded at the base. The coracoid was mainly thin and plate-like. The humerus had a slender shaft, was slightly twisted along its length, and was slightly bowed. The deltopectoral crest (where the deltoid and pectoral muscles attached) was weakly developed.
Skeleton of Maiasaura posed with a nest; the naming of this genus was one of numerous important developments in the Dinosaur Renaissance. Twenty years later, in 1964, another very important work would be published, this time by John H. Ostrom. It challenged the idea that hadrosaurs were semi-aquatic animals, which had been held since the work ...
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Thyreophora ("shield bearers", often known simply as "armored dinosaurs") is a group of armored ornithischian dinosaurs that lived from the Early Jurassic until the end of the Cretaceous.
The remains of Orodromeus were discovered by Robert Makela during the excavation in Teton County, Montana, of the Egg Mountain brooding colony of a much larger relative, Maiasaura. The type species , Orodromeus makelai , was named and shortly described by Jack Horner and David B. Weishampel in 1988 .
For example, “Romans did bring all sorts of really exotic animals into the amphitheater, not just for the pleasure of watching them be killed, but also because it symbolized allegorically the ...