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What made scientists think birds and reptiles were related?
Scientist think that birds are related to dinosaurs because as you study the fossilised bones of certain therapod dinosaurs especially dromaeosaurs you start to notice many similarities between them and modern day birds. The famous archeopteryx for example, which is historically considered the first bird, looked very much like a bird but still had claws on its wings and had a mouth full of teeth. Other dinosaurs from the same time period look even more like birds. In fact experiments done on modern day bird embryos show that if you play around with the genes of birds you can engineer dinosaur features such as teeth, long dinosaur tails etc. All the key features that people associate with birds developed when they were still dinosaurs. Dinosaurs had feathers, dinosaurs had oval shaped eggs, dinosaurs had beaks. The morphology of birds is so similar to some dinosaurs that scientist are starting to consider birds as not just related to dinosaurs but actually as avian dinosaurs.
Did dinosaurs have a cloaca or an anus?
A cloaca is a common chamber and outlet into which the intestinal, urinary, and genital tracts open. It is present in amphibians, reptiles (therefore dinosaurs), birds, elasmobranch fishes (such as sharks), and monotremes. Plancental mamals and most bony fishes have an anus.
What is archaeoptyeryx?
Archaeopteryx is a genus of bird-like dinosaur that lived during the Late Jurassic period. It is considered a transitional species between non-avian dinosaurs and modern birds due to its combination of dinosaurian and avian traits. Fossils of Archaeopteryx have provided important evidence for the evolutionary link between dinosaurs and birds.
Are birds and dinosaurs related?
Dinosaurs and birds are related in the same way all organisms on Earth are related to each other through common ancestry. However, just how close the relationship between dinosaurs and birds is continues to be a contentious issue. There have been many controversies in the study of the origin of birds. Early disagreements included whether birds evolved from dinosaurs or more primitive archosaurs. Within the dinosaur camp, there were disagreements as to whether ornithischian or theropod dinosaurs were the more likely ancestors. Although ornithischian (bird-hipped) dinosaurs share the hip structure of modern birds, birds are thought to have originated from the saurischian (lizard-hipped) dinosaurs, and therefore evolved their hip structure independently. In fact, a bird-like hip structure evolved a third time among a peculiar group of theropods known as the Therizinosauridae. A few scientists suggest that birds are not dinosaurs, but evolved from early archosaurs like Longisquama.Based on fossil and biological evidence, most scientists accept that birds are a specialized subgroup of theropod dinosaurs. More specifically, they are members of Maniraptora, a group of theropods which includes dromaeosaurs and oviraptorids, among others. As scientists discover more nonavian theropods closely related to birds, the previously clear distinction between nonbirds and birds has become blurred. Recent discoveries in the Liaoning Province of northeast China, which demonstrate many small theropod dinosaurs had feathers, contribute to this ambiguity.The consensus view in contemporary Paleontology is that the birds, Aves, are the closest relatives of the deinonychosaurs, which include dromaeosaurids and troodontids. Together, these three form a group called Paraves. The basal dromaeosaur Microraptor has features which may have enabled it to glide or fly. The most basal deinonychosaurs are very small. This evidence raises the possibility that the ancestor of all paravians may have been arboreal, may have been able to glide, or both.The Late Jurassic Archaeopteryx is well-known as one of the first transitional fossils to be found, and it provided support for the theory of evolution in the late 19th century. Archaeopteryx has clearly reptilian characteristics: teeth, clawed fingers, and a long, lizard-like tail, but it has finely preserved wings with flight feathers identical to those of modern birds. It is not considered a direct ancestor of modern birds, but is the oldest and most primitive known member of Aves or Avialae, and it is probably closely related to the real ancestor.
Which came first fish or amphibians or birds or mammals?
Dinosaurs emerged first. Some dinosaurs were birds, but they didn't come until later.
What living thing has an evolutionary link between Dinosaurs?
Birds have an evolutionary link between Dinosaurs...
Did birds evolve from lizards?
No, birds didn't evolve from lizards, but they did evolve from dinosaurs, a different group of reptiles. Dinosaurs are different from lizards especially because of their hip structure. Birds descended from a group of dinosaurs known as theropods (bipedal carnivores)
Are hens dinosaurs?
Yes (WITH A BIG MAYBE ATTACHED) The difference between certain therapod dinosaurs and birds is very small. Every feature we use to describe birds (beak, feathers, wings) first evolved on dinosaurs. In fact the morphology between birds and the raptor family of therapod dinosaurs is so similar many scientists to call birds avian dinosaurs.
Are dinosaur birds mammals?
Birds are now classed as dinosaurs, but most dinosaurs were not birds. Neither dinosaurs nor birds are mammals.
Which animal was alive first birds or dinosaurs?
Dinosaurs evolved first and then some dinosaurs evolved into birds. So all birds are technically dinosaurs.
What are dinosours related to?
Pterosaurs were closely related to the dinosaurs. Because birds have descended from dinosaurs, the closest living relatives of pterosaurs are birds. All birds are equally related to pterosaurs.
Were dinosaurs or birds the first beings?
Dinosaurs came before birds, because dinosaurs later on evolved into birds, therefore, making birds come along LATER then the dinosaurs. However dinosaurs were far from the first creatures on earth.
Is there a connection between birds and dinosaurs?
It is generally believed that birds evolved from small, feathered, meat eating dinosaur during the Jurassic period. This is because of the similarities between those dinosaurs and early birds, which include feathers, 'hollow' bones (really they have an internal honeycomb structure), beaks, and other similar features. Additionally, animals that appear to be evolutionary links between birds and dinosaurs exist, such as Archaeopteryx.
What was around longer birds or dinosaurs?
Both. If you think about it, birds evolved from dinosaurs, and some think birds are the only living dinosaurs left.
Were normal birds alive during the Dinosaur times?
birds are dinosaurs some birds that lived with dinosaurs were archeopteryx, confuisosornis, and avivisaurus these creatures are dinosaurs all birds were dinosaurs
What is the presumed evolutionary link between theropod dinosaurs and birds based on?
Otherwise known as dino birds, these dinos were the first "birds" to exist.
Are cassowary birds related to dinosaurs?
Yes. All birds are direct descendants of dinosaurs and are considered by many to be dinosaurs.
