1868: Relationship between birds and dinosaurs
The idea that birds are descendants of Theropoda dinosaurs came from Thomas Henry Huxley (1825-1895), an English biologist.
He correlated the birds particularly with the Compsognathus, the remains of which were discovered in 1861 and it was the most complete dinosaur skeleton until then. It was so well preserved that even its dinner can be seen on the remains. Can you discover it?