The Archaeopteryx is the oldest known fossil bird, now extinct. It dates from about 150 million years ago during the late Jurassic period. Although Archaeopteryx had feathers and may have been able to fly, it had similarities to dinosaurs, including its teeth, skull, and certain bone structures.
The first Archaeopteryx fossilized feather impression was found in 1860 in a limestone quarry in
In 1868, Thomas Henry Huxley interpreted the Archaeopteryx fossil to be a transitional bird having many reptilian features. Along with Compsognathus, a bird-sized and bird-like dinosaur, Huxley argued that birds and reptiles were descended from common ancestors. Decades later, Huxley's ideas fell out of favor, only to be reconsidered over a century later (after much research and ado) in the 1970's.