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B. Two caudal vertebrae of same; natural size. C. Single feather, found in 1861 at Solenhofen, by Von Meyer, and called Archaeopteryx lithographica; natural size. E. Profile of caudal vertebrae of same; one-third natural size. e, e. Direction of tail-feathers when seen in profile. f.
After the appearance of Archaeopteryx Lithographica, the first known bird, the myriad species descended from it. It is hard to isolate when the first owls evolved. The first owl may have come out of the Cenozoic era of 70 to 40 million years ago if not the latter part of the Mesozoic era, which was 135 to 70 million years ago.
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