Bids on "Gus" will start at $19 million, a steep price for public institutions. Specimens in private collections can be harder for researchers to examine, and they're practically impossible to include

A fossilized Edmontosaurus skull with a Tyrannosaurus tooth still embedded in its face has given scientists rare evidence of a dramatic predator-prey encounter. The discovery suggests the giant carnivore delivered an incredibly powerful face-to-face bite,

A 150-million-year-old bird fossil, Zhengheornis, reveals the first step in the evolution of the short tails seen in modern birds.

Dinosaur fossils are rare to find in Antarctica because of the unforgiving ice caps. But millions of years ago, the region was populated by lush forests.

A mislabelled fossil, forgotten and sitting in a museum drawer for decades is actually more special than previously thought. The skull fossil belongs to an ancient species of saber-toothed cat that roamed across western North America about five million years ago.

A vertebra from the British Antarctic Survey collection has been recognized for what it is -- the first dinosaur fossil found in Antarctica.

Researchers analyzed 200 fossil teeth from ancient mammals in China, revealing how they adapted and diversified after the mass extinction