Predecessors to dinosaurs missed the race to fill habitats emptied when 9 out of 10 species disappeared during Earth's largest mass extinction 252 million years ago. Or did they?
In a key geological moment about 66 million years ago, an enigmatic something killed off almost all the dinosaurs and some 70 percent of all other species living on Earth.
Scientists say they're homing in on the precise date of both the extinction of the dinosaurs 66 million years ago, and the massive impact that's believed by many to have caused it.
The Grand Canyon is dramatic enough today - but imagine it with roaming dinosaurs. It now appears that it's been around for 70 million years, a good 65 million longer than believed.
Scientists say they've - rather belatedly - identified a completely new type of large, horned dinosaur after re-examining fossils originally collected in 1958.
A US researcher is claiming to have found further evidence that ancient dinosaur proteins - and even DNA - may have been preserved until the present day.
Duck-billed dinosaurs had amazingly complex teeth - much more so than those of cows, horses, and other modern grazers - allowing them to chew tough and abrasive plants with great efficiency.
The mass extinction that took out the dinosaurs was already well underway by the time a six-mile asteroid slammed into Mexico's Yucatán Peninsula 65 million years ago, it appears.
A new species of feathered dinosaur has been discovered - and it's not closely related to birds, indicating that feathers may have been far more prevalent amongst dinosaurs than previously believed.
Scientists have developed a new laser technique to measure the weight and size of dinosaurs - and found they were much lighter than previously thought.
