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A 150-million-year-old winged beast has been identified as the missing link between dinosaurs and birds.
Archeopteryx albersdoerferi was able to fly thanks to its thin, inflated bones, similar to those of the birds of today.
However, it was different from the earlier species of archeopteryx because it had fused bones in the skull and fewer teeth, according to the researchers.
The main author, Professor Martin Kundrat, of the University of Pavol Jozef Safarik, Slovakia, said: "Archeopteryx albersdoerferi is one of the most important specimens of Archeopteryx because it is about 400,000 years younger than everyone else.
"This is the first time that many bones and teeth of Archeopteryx have been seen in all their aspects, including the exposure of their internal structure.Archeopteryx means "old wing". The first fossil skeleton was discovered in Germany in 1861 and is located at the Museum of Natural History in London.
Professor Kundrat and his colleagues used a state-of-the-art 3D X-ray scanning technique called synchrotron microtomography to virtually dissect the fossil.
This shows that albersdoerferi was a stepping stone for the evolution of flying dinosaurs into birds.
The discovery also kills claims that Archeopteryx was only a feathered dinosaur.
The findings come from the analysis of a fossil-sized raven discovered in a German quarry in 1990 and dubbed The Phantom.
Swedish researcher Prof Per Ahlberg said: "He shares more in common with modern birds than their dinosaur ancestors."
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