Dinosaurs

Geologist Allan Krill spotted these markings on a boulder the side of the Bright Angel Trail in 2016. The boulder weighs several hundred pounds.

Fallen Boulder at the Grand Canyon Reveals Prehistoric Reptile Footprints

313 million years ago, two reptilian creatures crept over this boulder's surface

An illustration of the 30-foot-long, dinosaur eating crocodilian Deinosuchus.

30-Foot 'Terror Crocodile' Ambushed Dinosaurs at Water’s Edge

Study says the five-ton extinct reptiles had teeth the size of bananas

An artist's illustration of the Triassic reptile Tanystropheus hydroides hunting with its long neck.

Study Reveals This Mysterious, Super Long-Necked Triassic Reptile Was a Marine Hunter

The creature’s neck was stiff like a giraffe’s and was nearly three times the length of its torso

Each of the more than 50 animatronic dinosaurs remains fully functional.

These Life-Size, Animatronic Dinosaurs Are Heading to New Homes

Yesterday, an auction house in Canada offloaded more than 50 robotic reptiles in a unique online sale

A Centrosaurus skeleton in the mass dearth assemblage at the Royal Tyrrell Museum

Dinosaurs Suffered From Cancer, Too

A bone containing signs of cancer is the first of its kind found in the fossil record

Baby sauropod on a nest, taken at the American Museum of Natural History's World's Largest Dinosaurs exhibit.

How Dinosaurs Raised Their Young

New research into eggshells and nesting sites help paleontologists unravel the family lives of the Mesozoic

An artist's rendering of Kongonaphon kely, a newly described 4-inch-tall reptile that lived in southwestern Madagascar some 237 million years ago. Researchers think the Triassic creature may be closely related to the common ancestor of dinosaurs and pterosaurs.

Giant Dinosaurs and Pterosaurs May Have Evolved From This Four-Inch-Tall Reptile

In Madagascar some 237 million years ago, the tiny <em>Kongonaphon kely</em> was chasing down insects on two legs

A fossilized Mussaurus egg that was the subject of one of two new studies documenting soft-shelled eggs at the time of the dinosaurs. Mussaurus was a long-necked, plant-eating dinosaur that grew to 20 feet in length and lived in modern-day Argentina between 227 and 208.5 million years ago.

First Soft-Shelled Dinosaur Egg Fossils Found

Twin discoveries reveal that some ancient reptiles laid soft-shelled eggs, challenging long-held assumptions in paleontology

An artist's rendering shows the armored dinosaur Borealopelta markmitchelli eating ferns, which new research shows made up the majority of its diet.

Exquisitely Preserved 'Mona Lisa' of Dinosaur Fossils Reveals Prehistoric Creature's Last Meal

Fossil plant matter found in the gut of the exquisitely preserved herbivore reveals its diet and even the season of its death

Artist impression of Allosaurus

Carnivorous Dinosaurs Like Allosaurus Were Cannibals

Tooth-marked bones show that huge flesh-eaters had no qualms about chomping their own kind when times got tough

An artist’s rendering of what an elaphrosaur may have looked like.

Rare 'Light-Footed' Dinosaur Discovered in Australia for the First Time

A single vertebra spotted by a dig volunteer was identified as a strange, slender-necked dinosaur called an elaphrosaur

An artist's reconstruction of Spinosaurus, showing a paddle-like tail that would have helped it swim.

Groundbreaking Fossil Suggests Spinosaurus Is First Known Swimming Dinosaur

Its paddle-like tail, unearthed in Morocco, suggests the Cretaceous carnivore ventured into the water to hunt

Artist's impression of the Chicxulub impact.

After the Dinosaur-Killing Impact, Soot Played a Remarkable Role in Extinction

The famous impact 66 million years ago kicked up soot into the atmosphere that played an even bigger role in blocking sunlight than experts had realized

Cricosaurus suevicus is an ancient relative of modern crocodiles that spent its life in the ocean.

Like Dolphins and Whales, Ancient Crocodiles Evolved to Spend Their Time at Sea

Researchers tracked changes in the crocodilian creatures’ inner ears to learn how they moved into the sea

The list covers findings in biology, justice and human rights, the environment, and more.

Fifty Things We’ve Learned About the Earth Since the First Earth Day

On April 22, 1970, Americans pledged environmental action for the planet. Here’s what scientists and we, the global community, have done since

Researchers recently scanned some of the oldest dinosaur embryos in the world

Digital Reconstructions Reveal 200-Million-Year-Old Dinosaur Embryo’s Unusual Teeth

New scans suggest unhatched dinosaurs reabsorbed a set of teeth during development

This illustration is an artist's interpretation of what a toothed pterosaur may have looked like 100 million years ago.

Four New Species of Prehistoric Flying Reptiles Unearthed in Morocco

These flying reptiles patrolled the African skies some 100 million years ago

Stromatolites at Lake Thetis, Western Australia

Why It’s So Difficult to Find Earth’s Earliest Life

Debate over Earth’s oldest fossils fuels the search for our deepest origins

Reconstruction of Dineobellator notohesperus and other dinosaurs from the Ojo Alamo Formation at the end of the Cretaceous Period in New Mexico by Sergey Krasovskiy. This reconstruction shows three Dineobellator near a water source, with the ceratopsid Ojoceratops and sauropod Alamosaurus in the background.

New Feathered Carnivorous Dinosaur Found in New Mexico

Dineobellator was a formidable predator and boasts the battle scars to prove it.

Asteriornis maastrichtensis, the world's oldest known modern bird, had a mashup of chicken-, turkey- and duck-like features.

At 67 Million Years Old, Oldest Modern Bird Ever Found Is Natural 'Turducken'

Remarkable fossil hints at the traits birds evolved just before an asteroid wiped their nonavian dinosaur kin

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