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|Do birds come from dinosaurs?
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|Autor:||Pablo Edronkin [ Mié Dic 21, 2005 9:35 pm ]|
|Asunto:||Do birds come from dinosaurs?|
All evidence indicates that not only birds are direct descendants from dinosaurs, but that in fact, both things are the same. Similarities are so striking that it is hard to pick up differences in many cases, and findings posterior to Archaeopterix, the fossil of the first or oldest bird on Earth do indicate that at the end of the age of dinosaurs, many species not considered birds before are actually dinosaur-bird species, some even of great size.
Many dinosaurs had beaks instead of teeth, and many birds of that age, like Ichtiornis and Baptornis had teeth in their beaks; pelvic bones were similar, arms and wings were alike and so on.
Thus, we should see birds not as descendants, but as the only group of dinosaurs that survived the K-T event, which was the apparent fall of a meteorite that cause a mass extinction 66,4 million years ago which wiped a lot of animals and plants, including the rest of the dinosaurs. Indeed, more expeditions will be needed to find out the exact evolution of birds, but rest assured: they are dinosaurs.
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