252 million years ago the largest extinction event occurred at the end of the Permian age. It wiped out almost 90 percent of all life in water. So far researchers had assumed that the ecosystems gradually recovered from this catastrophe over a long stretch of eight to nine million years and that large predators at the uppermost end of the food chain were the last to reappear.
About 65 million years ago, an asteroid or comet crashed into a shallow sea near what is now the Yucatán Peninsula of Mexico. The resulting firestorm and global dust cloud caused the extinction of many land plants and large animals, including most of the dinosaurs.
Accurate copies of fossilised bones can now be made from the combined use of computed tomography (CT) scans and 3D printers, according to a paper published today in the journal Radiology.
Dinosaurs were the largest animals to ever walk Earth, and they ruled the planet for more than 160 million years. The long-necked Argentinosaurus, with back vertebrae almost two metres high, possibly grew to 30 metres long and weighed up to 80 tonnes. So did the earth really shake for them when they mated?
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 fossil record can show evidence of sexual selection, say researchers, revealing how members of a species attract a mate.
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.
The reason herbivore dinosaurs got so big was their environment, not their diet, researchers say.
Universal Pictures has released a trailer for the 3D release of its classic dinosaur thriller.
Scientists say they've - rather belatedly - identified a completely new type of large, horned dinosaur after re-examining fossils originally collected in 1958.
Cope's Rule - which states that small animals tend to evolve into larger ones - is sometimes true, sometimes not, a new statistical model shows.
The mass extinction that saw the end of the dinosaurs was made worse than it might have been by the structure of the ecosystems of the time.
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.
SPACE has released a trailer for its upcoming dinosaur hunter spin-off.
Terra Nova will never get a second season, thanks a gigantic production budget, but the story can continue on in your imagination, with a little help.
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.
Liquid Comics has posted the first chapter of the Dinosaurs vs. Aliens motion comic online.