Archaeopteryx

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Archaeopteryx

the earliest known fossil bird (genus Archaeopteryx) found in the Jurassic period about 140 million years BP. The bird is characterized by the presence of teeth in the jaws, claws on the wing and a tail containing vertebrae.
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The oldest known bird, Archaeopteryx lithographica, lived roughly 150 million years ago and had modern feathers.
The famous fossil, the Thermopolis specimen of Archaeopteryx lithographica, made its way by truck from the Wyoming Dinosaur Center to the Stanford Synchrotron Radiation Lightsource (SSRL) in California, where it was meticulously scanned by one of the world's most powerful X-ray machines, a building-sized device created for physics research.
For more than a century, the lowest branches of the avian family tree seemed a lonely place, occupied by the solitary species Archaeopteryx lithographica, the oldest known bird.