Which species of birds is most likely to have evolved forelimbs that resemble dinosaurs?

Birds only inherited their beaks from their nearest common ancestor, and most birds that have ever lived have no beaks. The beak itself is a trait that has been mutated and is itself the result of natural selection, and it is better to say that the common ancestor of the bird today survives in competition because of the structure of the beak. Beaks are found in some ancestral types of the main dragon type, and later progressive pterosaurs and birds belong to convergent evolution, and similarly, the beaks of hydrosaurons and triceratops are also convergent evolution.

One reason, it's all because the beak makes them adapt to the environment. For birds and pterosaurs, the beak can replace the combination of jaws and teeth, and can reduce body weight while eating normally, and the beak also has the function of keeping the body of the bird and pterosaur streamlined when the bird and pterosaur are flying, and as a windward part, the beak can have the effect of a fairing cone. The advantage of the beak of birds is mainly to reduce weight, which can be perfectly adapted to their flight habits, and the beak can also take on the function of tearing and chewing the mouth of other animals with the structure of the bird's body, <>

Thus, the characteristics of the beak can be preserved by natural selection.

At present, birds (generally not large) mainly feed on small insects and plant seeds on the ground, and rarely prey on large animals, in the case of small food size, they can be swallowed directly without tearing and chewing, which makes the two important functions of the toothed mouth - tearing and chewing are not of much significance, but a simple beak with a structure, which can easily feed on various small insects and plants. As for digestion, birds have additional muscular and gastric aids, so there is no need to worry about digestive problems. Many medium-sized wading birds living in wetlands feed on fish and mollusks, and have a longer beak than a shorter, heavier beak, which makes it easier to pick up food.

Large birds of prey that need to tear their prey can also use their claws to replace part of their teeth to help tear their prey apart. At the same time, the beak also has great variability, such as the asymmetrical beak of the cross-billed finch that feeds on the pine cone, the unequal length of the shear-billed gull, the beak used for fishing, and so on. <>

It is very likely that birds evolved from theropod dinosaurs, so how could birds have evolved dinosaur-like forelimbs? Because the fingers of birds have degenerated. What is this intellectual disability problem?

Some large dinosaurs have returned to their ancestors with dinosaur-like limbs.

Are you saying that birds are inferior to dinosaurs? Will it evolve into a dinosaur? Isn't it said that birds evolved from small dinosaurs? Are you planning to evolve back again? Yes! No, it's degradation back, right?

Why are birds degraded?

It's better to use the word evolution.

1.The respiratory structure of birds and dinosaurs is a lung-air sac respiratory structure, and the bones of birds and dinosaurs are mostly hollow and strong. There are also many skeletal similarities between the neck and hips of the two.

2.The process by which dinosaurs transformed their forelimbs into wings is also a process in which the bones of the forelimbs are constantly healing. The anterior finger continues to heal in the later stages.

3.There are also similarities between dinosaur eggs and advanced bird eggs.

Archaeologists have found two bird's egg-shaped dinosaur eggs from a female dinosaur fossil. Carnivorous dinosaurs of the theropod order lay two eggs at a time, a reproductive capacity that was somewhere between primitive reptiles and birds. Archaeologists believe that the eggs were laid by theropod carnivorous dinosaurs, a type of dinosaur that includes the famous Tyrannosaurus rex.

Archaeologists also believe that the ancestors of the dinosaurs that laid these eggs may have been birds. In fact, it is likely that the newly discovered dinosaur eggs were laid by some kind of small dinosaur bird that lived at a critical time in the evolution of dinosaurs into birds. According to the French archaeologist Boufitten, the eggshells show a mixture of dinosaurs and birds, and they were laid by some dinosaurs that began to evolve into birds, and these small theropod carnivorous dinosaurs, which resemble birds, are the most likely to lay these eggs, similar to some feathered dinosaurs described on fossils of the same period, but much smaller.

4.Fossil sticky material confirms that dinosaurs and birds are homologous.

Archaeologists have unearthed a 68-million-year-old Tyrannosaurus rex leg bone in the United States that has found some soft tissue, a sticky substance that contains collagen. Scientists compared these proteins with 21 extant biological proteins, and they found that dinosaur collagen was very similar to the arrangement of birds. Biologists at Harvard University in the United States later extracted collagen from another Tyrannosaurus rex fossil, and after research, it was found that this protein is closest to the collagen of chickens.

Although they were unable to obtain DNA from the Tyrannosaurus rex's vital genetic command, they studied the genetic code in collagen. Biologists in the United States say that with more data, they might be able to determine the location of the Tyrannosaurus rex in the evolutionary tree from crocodiles to chickens and ostriches.

Bird skeletons have many structural similarities to dinosaurs, and all of these similar features can be put together in phylogenetic analysis. Some dinosaurs also had the same egg-incubating behavior as modern birds, covering their nests with their bodies to protect the eggs while keeping the temperature constant. In addition, both dinosaurs and birds swallowed gravel to help grind and digest food.

So, although scientists can't study the DNA of ancient dinosaurs, they can study the DNA of modern dinosaurs.

The spine bone structure is very similar, and there are some bone shapes and structures of the head, and many animals actually have similarities.

Dinosaurs and birds share many similarities in their bone structure. Here are some examples:

1.Hollow bones: The bones of dinosaurs and birds are light because they are both hollow. This makes them easier to fly or walk.

2.Vertebrae: Both dinosaurs and birds have similar structures in their vertebrae. They are all made up of a large number of similar small bones called vertebral bodies.

3.Supporting limb bones: Both dinosaurs and birds evolved their forelimbs to support them, allowing them to walk or fly. The shape of these bones bears many similarities between dinosaurs and birds.

4.Birds and dinosaurs were more intelligent and laid eggs in a similar way: amuse birds and dinosaurs tended to be more intelligent than other reptiles, which is reflected in the structure of their brains and bones. At the same time, their eggs are also very similar in shape and size.

Overall, dinosaurs and birds share a lot of similarities in their skeletal structure, suggesting a close evolutionary relationship between them.

From the early Cretaceous theropod dinosaur called "Chinese ornithosaurus", found that its structure, and birds have a great similarity, scientists also found that the Chinese ornithosaurus running speed is extremely fast, and in the process of studying the evolution of birds, scientists have also found that the ancestors of birds were not able to fly at the earliest, they also evolved from generation to generation, before finally having the ability to fly, so, scientists guess that perhaps the ancestors of birds gradually learned to fly in the process of running fast.

Modern birds evolved from a small carnivorous dinosaur of the suborder sauropods, a branch of dinosaurs. The first birds were Archaeopteryx with characteristics somewhere between dinosaurs and birds.

It is a dinosaur called Nguyen Quoc Dragon.

The consensus among scientists is that the direct ancestor of birds was a small dinosaur (Ostrom, 1967), and that the pseudocrocodile evolved into a dinosaur of dinosaurs, and then further evolved into Archaeopteryx, and then evolved into a new bird.

Archaeopteryx, which was previously thought to be a bird discovered in the Jurassic period, was thought to be a dinosaur in 2004. It is clear from the specimens that have been found that Archaeopteryx had feathers; hindfoot toe-to-toe type; carpal metacarpal and tarsometatarsal healing; Many features such as pelvic structure, clavicle, beak, mandibular joint pattern, and eyes are similar to those of birds.

Archaeopteryx had alveolar teeth and a long tail with caudal vertebrae; biconcave vertebrae; forewing metacarpophalanges free and clawed; Features such as the brain, sternum, ribs, and hind limbs are similar to those of reptiles. So Archaeopteryx is considered to be an intermediate link between reptiles and birds.

Dinosaurs can run, birds can fly into the sky.

Birds and dinosaurs have a common similarity to hatching and reproducing, and birds evolved from dinosaurs?

There are many similarities in bone structure. Not only are birds related to dinosaurs, but they may be descendants of smaller dinosaurs.

To be exact, the birds are descendants of dinosaurs. Du dinosaurs are ectothermic reptiles

Such as crocodiles, DAO lizards, snakes. Birds, on the other hand, are homeothermic animals that have evolved over millions of years of evolution and adaptation, and are able to regulate their own body temperature. There are many scientists who have studied and are familiar with the body, skulls, feathers, claws, bones, etc.

The earliest birds had claws that resembled dinosaur feet.

Dinosaur feathers are the same as bird feathers.

Terror nor the feathers of birds.

What are the similarities between the red fish bird?

The Yaolongs and Dendrisaurs, which are found in our country, are the ancestors of birds. When the Archaeopteryx fossil was first discovered, there was a controversy about whether Archaeopteryx was a bird or a dragon, but the lack of fossil evidence failed to overturn it, and the discovery of Zheng's Xiaotinglong completely classified Archaeopteryx as a dinosaur, and Archaeopteryx was the ancestor of the Velociraptor rex, not the ancestor of birds. But Archaeopteryx was an offshoot of the evolution of dinosaurs into birds.

During the Cretaceous period, the evolution of birds also diverged, with the emergence of anti-birds and modern birds. Anti-birds climbed the trees, and now the birds remain on the ground. By the late Cretaceous period, arboreal dinosaurs and anti-birds went extinct along with dinosaurs, but today's birds, which were not dominant in evolution, evolved into today's birds.

Evolution is a tree diagram, and the ancestors of birds are almost the same, and later they evolved different body characteristics and living habits because of the passage of time and different living environments.

It is now generally accepted that birds evolved from reptiles.

Once thought to be the ancestor of birds, Archaeopteryx lived in the Jurassic Age of the Chemory Order, and was about the medium size of today's birds, with rounded wings at the end and a tail longer than the body size. Because of its bird and dinosaur characteristics, Archaeopteryx is generally thought to be the link between them: probably the first creature to transform from a terrestrial creature to a bird.

In the 1970s, John Ostrom suggested that birds evolved from theropod dinosaurs, and that Archaeopteryx is the most important evidence of this. It retains some of the characteristics of birds, such as wishbones, feathers, wings and some opposite toes. It also has some dinosaur features, such as a long talus ascending process, interdental plate, ischial process, and a long herringbone tail.

Ostrum also found that Archaeopteryx was significantly similar to Chisauridae.

The first remains of Archaeopteryx were discovered in 1862, two years after Darwin published On the Origin of Species. The discovery of Archaeopteryx seems to confirm Darwin's theory, and has since become important evidence of the relationship between dinosaurs and birds, transitional fossils, and evolution. In fact, further research on dinosaurs in the Gobi Desert and China has provided more evidence on the relationship between Archaeopteryx and dinosaurs, such as feathered dinosaurs.

Archaeopteryx is closer to the ancestors of modern birds because it has many bird characteristics; The extent of its divergence from the birds of the time is still questionable.