 Starting in 1868, and following earlier suggestions by Karl Gegenbaur, and Edward Drinker Cope, Huxley made detailed comparisons of "Archaeopteryx" with various prehistoric reptiles and found that it was most similar to dinosaurs like "Hypsilophodon" and "Compsognathus".The discovery in the late 1870s of the iconic "Berlin specimen" of "Archaeopteryx", complete with a set of reptilian teeth, provided further evidence.Like Cope, Huxley proposed an evolutionary relationship between birds and dinosaurs.