|The 150 million year old skull of Kaatedocus siberi from Wyoming, showing its distinctive teeth|
|A reconstruction of its 'smile'|
The Kaatedocus fossils pre-date even the oldest Diplodocus specimens, but strangely they do not display any cranial increases between the two species.
Kaatedocus lived in an environment populated by a number of powerful carnivores. So how did it survive? While it was smaller than its descendants, it still had a long, powerful tail able to deter potential predators. A recent theory suggests that many of the so called dinosaur species were actually the undeveloped, juvenile forms of adults and that dinosaurs were only a third as diverse as previously thought. These new finds of bizarre dinosaurs show that their family tree is still under-explored. Yet Palaeontologists continue to unearth the remains of new species every year, and as they do, add new branches to the tree of life and their story.