Theropod Discovery Challenges the Dinosaur-to-Bird Theory

Beast legs explore the challenges of the theory of dinosaurs and birds For many years dinosaurs have long been considered as an ancestor of contemporary birds. Just looking at the picture of the dinosaur shows that there are many physical similarities between these reptiles and modern birds. Normally, the shape of the foot and chest are very similar. Several dinosaurs seem to evolve into contemporary wings, and some dinosaurs have even feathers (6). The idea of ​​discovering Scipionyx samniticus with good preservation in Italy has recently been challenged.

In 1868, Thomas Henry Huxley initially proposed the possibility that dinosaurs are ancestors of birds. After the study of Gerhard Heilmann in the early twentieth century, the theory of birds, descendants of dinosaurs, was abandoned and backed their idea of ​​being a descendant of Theodontto in a broad sense. However, as the later discovery shows, the clavicle (or a single fused wishbone from another clavicle) actually does not exist; although they were discovered early in Oviraptor in 1924, While I was mistaken for clavicle. In the 1970s, John Ostrom resumed the dinosaur bird theory with the advent of branch analysis and the discovery of small amphibians and early birds. And it will increase in the coming decades. Get motivated. Especially worth noting is the fossil of the Yixian stratum, where various kinds of beast legs and early rising birds are seen, usually accompanied by certain feathers.

Birds are now considered to be the only surviving strain of the animal leg dinosaurs. In traditional classification methods, birds are considered independent classes, a unique super dinosaur developed from dinosaurs. However, most contemporary paleontologists related to dinosaurs refuse to use traditional classification to support phylogenetic taxonomy; this approach is applied to all groups of nature Descendants must also be included in the group. Therefore, birds are regarded as dinosaurs and dinosaurs are not extinct. Birds are classified as belonging to the Manila - Lutra subgroup and they are Cerro Saaurus, Equisotory dinosaurs, Saudi Arabs, dinosaurs.