New scans of a tiny Cretaceous jaw and claw show the tyrant dinosaurs started out the size of a small dog. THE FIRST KNOWN fossils of baby tyrannosaurs reveal that some of the largest predators ever to stalk the Earth started life about the size of a Chihuahua—with a really long tail.

The skeleton is still far from complete but paleontologists say what they've found suggests the dinosaur may be more than 120 feet long

When a dog-sized Psittacosaurus was living out its days on Earth, it was probably concerned with mating, eating, and not being killed by other dinosaurs. It would never even have crossed its mind that, 120 million or so years later, scientists would

We know a lot about dinosaurs -- what they looked like, what they ate and what killed them off -- but no fossils have definitively preserved two dinosaurs in the act of mating.

Paleontologists uncovered a great deal about the “terrible lizards” this year

One theory is that reckless young bison and mammoths got into more trouble.

A Brazilian dinosaur with stiffened pairs of ribbonlike feathers emerging from the shoulders is unlike any found before.

For the entirety of my career as a journalist covering paleontology, I’ve been wanting to know: What does a dinosaur’s butthole look like? When I wrote My Beloved Brontosaurus, a book about dinosaur biology, the chapter on reproduction required a lot of time imagining the nature of a Jurassic behind; one had yet to be found preserved. Even dinosaur models and sculptures often demur on the point of the dino butt, leaving the terrible lizards with terrible constipation.

He was hiking with his father in Alberta, Canada, when he stumbled upon the Hadrosaur remains.

Buyer unknown, but paleontologists worry researchers will lose access

Several complete skeletons of the unusual feathered two-fingered dinosaurs were unearthed in the Gobi Desert.

Huge volcanic eruptions 233 million years ago pumped carbon dioxide, methane, and water vapour into the atmosphere. This series of violent explosions, on what we now know as the west coast of Canada, led to massive global warming.

Fossilised sperm discovered inside a mussel-like crustacean that was trapped in amber 100 million years ago may be the oldest ever found, scientists say. The female ostracod was unearthed by an international team of palaeontologists. They believe it mated shortly before becoming trapped in the resin. Their findings, published in Proceedings of the Royal Society B, provide "an extremely rare opportunity" to learn more about the evolution of the reproductive process, they added.

Scientists examining an ancient Aboriginal site are split over whether charred rocks and weather-worn shells are 120,000-year-old evidence of Indigenous life.

Earth looked very different long ago. Search for addresses upto 750 million years ago in Earth history

While many fossils have been flattened by time and the elements, a titanosaur found in an egg was preserved in three dimensions.

Four bones found at Shanklin belonged to a new species of theropod dinosaur, a study finds.

The 106-million-year-old tracks suggest that other puzzling nearby fossils were also likely made by a bipedal croc ancestor, not a giant pterosaur.

Scientists are stunned to find that some ancient crocodiles may have moved around on two feet.

'The worst-case scenario is exactly what happened,' researchers reveal