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Archaeopteryx
c. 150 million years ago (found 1861)· Fossil or site· Animals
Well establishedStrong fossil, genetic or geological evidence.
A crow-sized feathered animal from 150-million-year-old German limestone, long the oldest known bird and a classic transitional fossil.
See it on the Life map →What happened
Archaeopteryx comes from the fine-grained Solnhofen limestone of Bavaria, Germany. A single feather was described in 1861, and the first skeleton surfaced the same year, two years after Darwin's On the Origin of Species. It mixes features: flight feathers and a wishbone like a bird, but teeth, clawed fingers and a long bony tail like a small theropod dinosaur. About a dozen skeletons are now known. Whether it flapped strongly or mostly glided is still argued.
Why it matters
Arriving just after Darwin's 1859 book, it gave early support to evolution and to transitional forms, and it still anchors the dinosaur-to-bird story.
The evidence (fossils, genes, rocks)
About a dozen skeletons from Solnhofen, several with feather impressions; the London specimen (1861) and the more complete Berlin specimen (1870s) are the best known.
Still debated
Some analyses place it just outside true birds, among their closest dinosaur relatives. How well it flew remains debated.
Connections (2)
▸Archaeopteryx is an early example of how Birds evolve from dinosaursWell established
The connection
Archaeopteryx combines bird features, such as lopsided flight feathers and a wishbone, with dinosaur features like teeth, clawed hands and a long bony tail. That makes it an early member of the bird line, caught partway through the transition from small feathered dinosaurs to fliers.
When and how
Solnhofen limestone, Bavaria, Germany, about 150 million years ago; first skeleton found in 1861 and named that year by Hermann von Meyer.
The evidence
About a dozen skeletons, several with clear feather impressions, studied for over 160 years and included in many family-tree analyses.
Debates and open questions
Some analyses place it among the close dinosaur relatives of birds rather than true birds; Chinese fossils such as Anchiornis complicate the picture.
▸Archaeopteryx gave early support to Evolution by natural selectionWell established
The connection
Two years after Darwin's book, quarry workers in Bavaria found a skeleton with feathers and wings but also teeth, clawed fingers and a long bony tail: an apparent link between reptiles and birds. Thomas Henry Huxley used it, along with small dinosaurs like Compsognathus, to argue that birds evolved from reptiles, a striking case of the transitional forms Darwin predicted.
When and how
Solnhofen limestone, Bavaria, Germany, 1861; bought by the British Museum in London in 1862 and described by Richard Owen in 1863; Huxley's arguments followed from 1868.
The evidence
Darwin added Archaeopteryx to later editions of the Origin, and about a dozen skeletons are now known.
Debates and open questions
Whether Archaeopteryx is on the direct line to modern birds or a side branch among feathered dinosaurs, and how well it could fly.