Dinosaurs

It isn't hard to imagine the world full of dinosaurs, even though these extinct animals haven't walked the earth for millions of years. Learn all about dinosaurs, including early dinosaur discoveries, dinosaur fossils, and dinosaur extinction.

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That's the titanosaur, one of the largest land animals to ever exist, dwarfing nearly everything around it. Roaming the planet during the Late Cretaceous period — approximately 100 million years ago — titanosaurs are part of a family of sauropod dinosaurs known for their massive size, long necks and incredible diversity.

By Talon Homer

Argentinosaurus is one of the largest known dinosaurs to have ever walked the Earth, and its sheer size captures the imagination of scientists and enthusiasts alike.

By Talon Homer

They lived about 30 million years apart and never set foot on the same continent. Yet Giganotosaurus carolinii is always getting compared to the world's most popular dinosaur, the beloved and well-known Tyrannosaurus rex, both vying for the position of the largest carnivorous dinosaur in history.

By Mark Mancini & Talon Homer

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The next time a 4-year-old asks what the biggest dinosaur ever was, you can respond confidently: It was the titanosaur Patagotitan mayorum (simply "Patagotitan" for short), a colossal creature that lived more than 100 million years ago during the Late Cretaceous period.

By Ada Tseng

Dinosaurs ruled the Earth millions of years ago, and while many were peaceful herbivores, others were some of the most dangerous animals to ever walk the planet.

By Mack Hayden

Determining the biggest dinosaur is a tricky process. Dinosaurs are extinct, so scientists can't simply go out and measure the world's biggest dinosaurs.

By Sascha Bos

Utahraptors lived around 135 million years ago in the late Cretaceous Period. So what does salt have to do with these massive dinosaurs whose fossils were first discovered in 1975?

By Mark Mancini

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Known by the nickname "Mesozoic Cow," the African dinosaur Nigersaurus taqueti has also had its face compared to a vacuum cleaner.

By Mark Mancini

Fossils of just 12 individual Archaeopteryx, a winged dinosaur that live during the Jurassic, have ever been found. Aside from the rarity, what else makes this unique dinosaur so special?

By Mark Mancini

Tyrannosaurus rex, one of the fiercest meat-eaters ever, is the animal that probably springs to mind when most of us hear the word "dinosaur."

By Mark Mancini

Ankylosaurus was a dinosaur with short, squat legs that allowed it to run at about 6 miles per hour - fast, but not fast enough to outrun a large carnivorous predator like Tyrannosaurus rex.

By Patty Rasmussen & Talon Homer

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Stegosaurus, an herbivorous dinosaur from 149 million years ago, walked on four legs, had a long, beak-tipped skull, a row of spikes adorning its tail and a pea-sized brain.

By Mark Mancini

Triceratops - which literally means "three-horned face" - is one of the most spectacular and well-known of all dinosaurs. It shared the Cretaceous landscape with, and probably was preyed upon by, Tyrannosaurus rex.

By Mark Mancini

Constantly compared to the Tyrannosaurus rex, the Giganotosaurus was one of a handful of dinosaurs that rivaled, or possibly exceeded, the creature in size.

By Talon Homer

The villainous dinosaur from 'Jurassic Park' probably never had an affinity for water.

By Mark Mancini & Talon Homer

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Someone just paid $2.36 million to take home an exquisite dinosaur skeleton. The sale has added to the growing scientific anxiety about the commodification of precious, irreplaceable fossils.

By Mark Mancini

Scientists are at odds about whether Velociraptors worked together to take down their prey.

By Mark Mancini

Tyrannosaurus rex was a giant predator that roamed the earth, so why did it have such tiny arms?

By Mark Mancini

Scientists generally agree that dinosaurs sported colorful, feather-like plumage. So do moviemakers lack imagination, or do audiences?

By Chris Opfer

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OK, hop in your time machine and go back 67 million years or so to the Cretaceous period. Then find a Tyrannosaurus rex and challenge it to a race. Sounds crazy, huh? Could you really outrun a Tyrannosaurus rex?

By Alison Cooper

It isn't hard to imagine this scene even though dinosaurs haven't walked the earth for millions of years. Dinosaurs have captured our imaginations. These dinosaur articles have been written to lead you into the exciting world of dinosaur research and back to the "Age of Dinosaurs."

By the Editors of Publications International, Ltd.

A full grown Allosaurus could be up to 34 feet long, stand 9 feet tall and weigh around 3 tons. This dino was a monster who, scientists suspect, would even eat his own kind.

By Mark Mancini

Apatosaurus was a huge sauropod from the Jurassic period. And there's a debate that's been raging for decades about whether its genus should cancel out the Brontosaurus entirely.

By Mark Mancini

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Brachiosaurus has been portrayed in popular culture many times, but the representations of this mysterious dinosaur are largely based on another massive dino called Giraffatitan brancai.

By Mark Mancini

Supersaurus was a dinosaur that truly deserved its name. It measured about 100 feet in length and lived in North America. This dinosaur lived on a diet that consisted mostly of chutes and leaves from the tops of trees.

By the Editors of Publications International, Ltd.