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While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, ... (144 ft) long and a colossal weight range of around 110 000 ...
At long irregular intervals, ... dinosaurs were the dominant land animals on Earth. ... [103] [104] [105] Around 50 ka they start colonising the other continents, ...
At around 79 million years, it ... especially dinosaurs, which were at their most diverse stage. ... Up to 2 m long and 0.5 m high at the hip, ...
The Mesozoic Era [3] is the era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods.It is characterized by the dominance of gymnosperms such as cycads, ginkgoaceae and araucarian conifers, and of archosaurian reptiles such as the dinosaurs; a hot greenhouse climate; and the tectonic break-up of Pangaea.
An international team found dinosaurs had been evolving and expanding, but showed a sudden downturn around 76 million years ago. Dinosaurs were in decline up to 10 million years before asteroid ...
One of the longest complete dinosaurs is the 27-metre-long (89 ft) Diplodocus, which was discovered in Wyoming in the United States and displayed in Pittsburgh's Carnegie Natural History Museum in 1907. [26] There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils.
The earliest dinosaurs were unremarkable, bit players on a supercontinent crowded with other ancient reptiles when they first evolved around 230 million years ago.
The results of this study, which were based on estimated real global biodiversity, showed that between 628 and 1,078 non-avian dinosaur species were alive at the end of the Cretaceous and underwent sudden extinction after the Cretaceous–Paleogene extinction event. [136]