For more than a hundred years, scientists have misclassified the horned dinosaur Torosaurus, researchers say: It's really just the adult version of Triceratops.

In 1980, a controversial paper proposed that a giant asteroid had struck Earth at the end of the Cretaceous period, killing the dinosaurs and every other large land vertebrate. Years later, impacts have been proposed as the cause of every other known mass extinction. What impact has Impact Theory had on understanding these events?

A new discovery of fossilized footprints of tetrapods — the earliest known vertebrates with four limbs instead of fins — is changing what scientists thought about the timing of the transition from swimming to walking vertebrates.

Whether dinosaurs were warm-blooded or cold-blooded has been a long-standing question, but new research on the biomechanics of two-legged dinosaurs adds more weight to the case for warm-bloodedness.

Paleontological finds provide evidence both for and against dinosaurian ancestry — and many evolutionary puzzles remain: How did hands become wings? Did any dinosaurs have feathers? How did birds’ unusual, highly flight-specific respiratory systems evolve? Each new dinosaur discovery seems to muddy the picture further.

Tyrannosaurus rex was one of the most efficient predators to ever walk on Earth, apparently uniquely designed to swiftly run down and kill prey. But scientists have discovered a fossil that closely resembles the powerful predator — a smaller, "mini-me" version of the T. rex that lived 60 million years earlier.

Meet ART Evolved, where lifelong dinosaur enthusiasts share two things: a fascination with dinosaurs — usually going back to early childhood — and an inclination to daydream about how to visually resurrect these and other ancient creatures, complete with skin colors, feathers and movements.

When it comes to mass extinction events, what seems like a simple tale — for example: dinosaurs die, mammals take over — is much more complicated. But extinctions aren't random, either: Written in the rocks are certain "rules" these events seem to follow.

The discovery of collagen in the fossilized bones of a hadrosaur adds new evidence that soft tissues can be recovered from fossils that are tens of millions of years old.

Newly discovered Tianyulong confuciusi, a small bird-hipped dinosaur, may have had "protofeathers" on its spine and tail. The discovery may mean rethinking the evolution of feathers and flight: Scientists previously thought birds, and modern feathers, evolved from the lizard-hipped branch of the dinosaur tree.

The lambeosaur was a puzzle of a dinosaur: an odd-looking duck-billed creature with a curious hollow crest on its head. The crest concealed complex nasal airways whose function has been a mystery — until now.

Those who study coprolites — fossilized feces — get names like Doyenne of Doo-Doo, Professor Poop or Doctor of Dung. They give talks loaded with puns and double-entendres. They don’t get taken seriously by their colleagues. But coprolites add biological information not available from any other source.