“Lost world”: In 1912, the famous British writer Sir Arthur Conan Doyle published his novel about an expedition to a mesa in the South American jungle, so remote that dinosaurs could have survived on it until the present. Large, mysterious mesas, the Tepuis, rise from the rainforest plains between Orinoco and Amazon. On one of them, the Cerro Yapacana, dinosaurs have not survived – but something else has: a small, reddish shimmering frog, genetically so extraordinary that it has been declared a separate species from its poison dart frog kin.