The ancient beast that helped Georges Cuvier invent the science of paleontology

Nature · Published 3 October 2026 Swipe more like this →

In short: Long before dinosaurs captured the public imagination, French naturalist Georges Cuvier studied fossils from Montmartre to prove that entire species could vanish from the Earth. His work on the ancient, three-toed mammal Palaeotherium fundamentally shifted our understanding of extinction and the deep history of life on our planet.

In 1782, Robert de Lamanon first described fossils from the quarries of Montmartre, mistakenly theorizing that the creature was an amphibious, fish-eating animal. It was not until 1798 that Georges Cuvier began a rigorous study of these remains. By 1804, Cuvier had officially erected the genus Palaeotherium, meaning ancient beast, and debunked Lamanon’s hypothesis. Cuvier’s meticulous analysis of these fossils, which were embedded in harder, deeper sediments than other known mammals, is widely considered the true birth of modern paleontology.

Palaeotherium was a diverse genus of equoid mammals that thrived in Europe from the Middle Eocene to the Early Oligocene. These creatures were evolutionarily derived, characterized by three-toed limbs and specialized teeth for browsing on leaves and fruit. They ranged significantly in size, from the small P. lautricense, weighing about 36 kg, to the massive P. giganteum, which may have exceeded 700 kg. Their anatomy allowed them to niche-partition alongside other palaeotheres, such as Plagiolophus, to survive in the isolated archipelagos of Eocene Europe.

The genus faced a major turning point during the Grande Coupure, a faunal turnover event in the early Oligocene driven by increased glaciation and competition from immigrant Asian species. While most Palaeotherium species went extinct, the cursorial P. medium survived briefly due to its ability to travel efficiently across open landscapes. Today, the legacy of these animals persists not only in our understanding of evolutionary succession but also in the history of scientific representation, from Cuvier’s early skeletal reconstructions to the famous, if anatomically outdated, sculptures at the Crystal Palace Dinosaurs exhibition.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The Unarmed Beast That Pioneered Our Understanding of Ancient Life
• Georges Cuvier proved species go extinct, yet rejected evolution entirely
• The giant marine lizard that forced science to accept the reality of extinction
• Why did it take until the 19th century to accept that species go extinct?
• Why Charles Darwin called this South American giant the strangest animal ever discovered
• The cave lion was a distinct, massive predator that roamed the ancient mammoth steppe.
• These massive Miocene ruminants evolved bizarre, Y-shaped headgear for ancient combat and display
• The forgotten giants that dominated the world after the dinosaurs vanished
• Meet the pademelon, the tiny, elusive marsupial hiding in Australia’s dense forest undergrowth.
• The regal blue tang is a reef-dwelling surgeonfish with a hidden defensive weapon.
• The ancient paddlefish survived the extinction of dinosaurs but could not survive modern dams.
• Why are bright green parakeets screaming through the grey skies of British cities?

More in Vertebrates · More in Nature · Latest · A–Z · All topics