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The first fossil of Archaeopteryx, which lived about 150 million years ago, was found in the Solnhofen Quarry in Germany. Archaeopteryx has an interesting collection of characters that led to the hypothesis that it represented an evolutionary transition between modern-day birds and small bipedal dinosaurs. The fossil reveals the imprint of feathers, which connect Archaeopteryx to birds, although they do not present direct evidence of flight. Unlike birds, however, Archaeopteryx was shown by the fossil record to have had teeth, functional claws on the wings that may have been used for climbing trees or holding prey, and a long, bony tail. Birds have a fused collarbone, which was found in Archaeopteryx as well. However, the structure of the sternum differed between the two. In birds, the sternum is keeled (raised and slightly concave); the keel of the sternum serves as an attachment site for the flight muscles. Archaeopteryx had a flat sternum, similar to that found in reptiles.
The feathers of Archaeopteryx may have been used for flight. However, it is likely that they were originally used for
◦ protection from parasites.
◦ protection from predators.
◦ nest building.
◦ insulation.
the history of life according to fossil records
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