Search results
Results from the WOW.Com Content Network
Ancestrally, dinosaurs showed approximately 50 caudal vertebrae, although their number, size, and shape varied considerably in the separate groups. The number of caudals decreased along the evolutionary line leading to modern birds; in the latter, the remaining caudals are fused together into a pygostyle.
The mode of Mesozoic dinosaur body masses is between 1 and 10 metric tons (1.1 and 11.0 short tons). [139] This contrasts sharply with the average size of Cenozoic mammals, estimated by the National Museum of Natural History as about 2 to 5 kg (4.4 to 11.0 lb). [140] The sauropods were the largest and heaviest dinosaurs.
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. Thyreophorans are characterized by the presence of body armor lined up in longitudinal rows along the body.
This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. List of stratigraphic units with dinosaur body fossils; List of stratigraphic units with dinosaur trace fossils. List of stratigraphic units with dinosaur tracks. List of stratigraphic units with ornithischian tracks
tr This is a list of stratigraphic units from which dinosaur body fossils have been recovered. Although Dinosauria is a clade which includes modern birds, this article covers only Mesozoic stratigraphic units. Units listed are all either formation rank or higher (e.g. group).
Dinosaur classification began in 1842 when Sir Richard Owen placed Iguanodon, Megalosaurus, and Hylaeosaurus in "a distinct tribe or suborder of Saurian Reptiles, for which I would propose the name of Dinosauria." [1] In 1887 and 1888 Harry Seeley divided dinosaurs into the two orders Saurischia and Ornithischia, based on their hip structure. [2]
Kids will love this dinosaur-themed lunch, from sandwiches to cookies to even a 'dinosaur egg' AOL.com Editors. August 12, 2019 at 1:31 PM. ... Cut out a dinosaur shape with a cookie cutter.
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.