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.

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.

A 66m-year-old murder mystery has finally been solved, researchers say, revealing an enormous asteroid struck the killer blow for the dinosaurs. The Cretaceous/Paleogene extinction event resulted in about 75% of plants and animals – including non-avian dinosaurs – being wiped out. But the driving cause of the catastrophe has been a topic of hot debate.

A story for my granddaughter about oxygen, evolution, and our planet’s fate. By Walter Murch

A mysterious 68-million-year-old fossil found on Seymour Island off Antarctica’s coast that looked like a deflated football has turned out to be a unique find - the second-largest egg on record and one that may have belonged to a huge marine reptile that lived alongside the dinosaurs.

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.

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

The discovery that the badger-like animal lived alongside dinosaurs challenges ideas about mammals.

The interstellar object (alternatively a comet or an asteroid) that killed the dinosaurs when it slammed into Earth didn't work alone. Researchers have shown previously that its after-effects, such as tidal waves and earthquakes, played an important role in the mass extinctions of three-fourths of plant and animal life. Now, new research suggests that one of the most important factors was the soot-rich smoke from fires sparked by the collision.

New discoveries have raised the possibility of exploring dino genetics, but controversy surrounds the results

In 2006, an amateur fossil hunter made an unprecedented find: two dinosaurs fossilized while apparently locked in battle. A court case followed over mineral versus surface rights, bringing into question the future of fossil discovery in the US.

Prints show the tracks of three ‘titanosaurs’ that took a seaside stroll more than 165 million years ago.

The tiny skull of what is thought to be the smallest known dinosaur that lived during the age of the dinosaurs has been discovered in 99-million-year-old amber from Myanmar.

The complete skull of a previously unknown species of bird-like dinosaur has been discovered trapped in a chunk of 99-million-year-old amber. Smaller than the size of the tiniest hummingbird alive today, its head was the size of a thumbnail, its jaw packed with serrated teeth and its eyes bulging and lizard-like. Despite its teeny-tiny stature, the creature was likely a predator.

Someone call Steven Spielberg

The "Reaper of Death" is Canada's first new tyrannosaurus species in 50 years.