 The scientific debate that started immediately after the publication of "Origin" led to a concerted effort to look for transitional fossils and other evidence of evolution in the fossil record.There were two areas where early success attracted considerable public attention, the transition between reptiles and birds, and the evolution of the modern single-toed horse.In 1861 the first specimen of "Archaeopteryx", an animal with both teeth and feathers and a mix of other reptilian and avian features, was discovered in a limestone quarry in Bavaria and described by Richard Owen.