Dinosaurio Bird
Near relatives of the dromeosaurios were carnivorous, agile dinosaurios, of small size and aspect somewhat similar to the birds. Their bodies were covered with plumón, the emplumados arms seemed wings, and the claws of the feet allowed them to climb to the trees. Them it is not known dinosaurios like dinosaurios-bird, they were not birds like which we know today, but either.
• Archaeopteryx, Jurásico, 150 ms.a. Europe, 60 cm in length
Archaeopteryx had pens and a fuze, both characteristics of the birds. The pens of the wings were asymmetric and could have allowed to him to fly. On the other hand, the teeth, the flexible neck, the fingers with claws, the long legs and the bony tail are reptilianos characteristics. In spite of their aspect of bird, the muscles of their wings were not too strong and possibly it could not fly great distances. The claws of their wings could help him to cling and to climb up the trees. Once in the tree, Archaeopteryx could use its wings to glide and to move from a branch to another one.
• Protarchaeopteryx, Jurásico, 150 ms.a. Asia, 1 m of length
Protarchaeopteryx, dinosaurio emplumado Chinese, is remarkable by its long arms, equipped with hands of three fingers with claws, and by their tail in fan form. The pens of their wings were symmetrical, like those of the modern ápteras birds. It makes think that Protarchaeopteryx was incapable to fly. Nevertheless, since their arms and hands are so similar to those of the small carnivorous dinosaurios, one thinks that the fluttering of the birds evolved from the heave whose objective era to take hold the prey. Pero so that they developed to pens the carnivorous dinosaurios if, at least initially, did not use them to fly? The answer seems to be that the pens were developed like average insulator to maintain the body hot.
• Microraptor, Cretácico, 125 ms.a. Asia, 40 cm in length
Microraptor, dinosaurio with pens Chinese, was an early member of the dromeosaurios, the family of the running lizards, who includes the Velociraptor. Like in other dinosaurios-bird, the pens of Microraptor completely were not developed and very possibly it could not fly. The body was covered with warm plumón. The scientists who have studied the feet think that Microraptor could use them to maintain itself on the branches of the trees, which suggests passed part of their time in them, moved away of the ground. The numerous small teeth allowed him to crush insects and other prey.
• Bambiraptor, Cretácico, 75 ms.a. North America, 1 m of length
Of a size similar to the one of a hen, Bambiraptor was small dinosaurio carnivorous place setting of smooth pens that maintained it warms up. Surely it could not fly, but he was a runner quick, able to give to hunting to small reptiles and mammals. To its prey, it killed them with a combination of bites offered with his sharpened teeth, zarpazos of its long later claws and possibly also with blows of its tail in whip form.
China is outstanding like place of discovery in emplumados dinosaurios, concretely a zone of the country where the rock of fine texture has conserved the most delicate impressions of the pens. From these findings, the existing bonds between the dinosaurios and the birds are being clarified.
• Caudipteryx, Cretácico, 130 ms.a. Asia, 1 m of length
Caudipteryx, dinosaurio emplumado Chinese, could not fly. The arms did not have the length sufficient to act like wings and their symmetrical, straight and uniform pens, were inadequate for the flight. In order to fly as a bird asymmetric pens, curved are needed and unequal. Caudipteryx had long legs and a small head with teeth in the frontal region of the superior jaw. The tail in fan had pens of 20 cm in length. Like some modern birds, it ingested small stones with which crushed his food.
• Sinornithosaurus, Cretácico, 125 ms.a. Asia, 1 m of length
The most remarkable discovery on Sinornithosaurus, dinosaurio carnivorous Chinese as large as a turkey, was not that it had pens, but that could flutter with its arms. This was possible because escápulas allowed to the heave and the elevation of the arms over shoulders, like in the birds. The scientists think that Sinornithosaurus used east movement of fluttering in its arms to maintain the balance while ran quickly persecuting the prey, that it captured and it devoured.
• Sinosauropteryx, Cretácico, 130 ms.a. Asia, 1 m of length
When the scientists observed the stomach cavity of Sinosauropteryx, a dinosaurio-bird of China, found rest of their last food. This creature similar to a áptera bird carnivorous era without a doubt, since its stomach contained the bones of the jaw of a small mammal. Sinosauropteryx, like many other terópodos, had sharpened teeth of edges sawn, adapted to trinchar the meat. Incapable to fly, probably the pens isolated their body, maintaining warms up it.
• Beipiaosaurus, Cretácico, 125 ms.a. Asia, 2.1 m of length
Voluminous and heavy, Beipiaosaurus, coming from China, is the greater one of the dinosaurios-bird well-known to date, with pens partly or in the totality of its body. The pens were abundant mainly in the extremities. The front members finished in curved and sharpened claws like those of Therizinosaurus, with which he is related. Some scientists think that he was herbívoro.
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