One of London's Natural History Museum's greatest treasures, a 147-million-year-old Archaeopteryx fossil.

This 147-million-year-old Archaeopteryx fossil, owned by London's Natural History Museum, is one of only seven in the world. Discovered in Germany in 1861, it was the first fossil found of the small, meat-eating bird. Scientists used X-ray scans of its braincase to create 3-D reconstructions and investigate the anatomy of the brain in detail. Credit: Natural History Museum

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